[821] | 1 | /* vi: set sw=4 ts=4: */
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| 2 | /*
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| 3 | * Utility routines.
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| 4 | *
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| 5 | * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
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[1765] | 6 | * Copyright (C) 2006 Rob Landley
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| 7 | * Copyright (C) 2006 Denis Vlasenko
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[821] | 8 | *
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[1765] | 9 | * Licensed under GPL version 2, see file LICENSE in this tarball for details.
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[821] | 10 | */
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| 11 |
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[1765] | 12 | #include "libbb.h"
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[821] | 13 |
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[1765] | 14 | /* All the functions starting with "x" call bb_error_msg_and_die() if they
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| 15 | * fail, so callers never need to check for errors. If it returned, it
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| 16 | * succeeded. */
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| 17 |
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[821] | 18 | #ifndef DMALLOC
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[1765] | 19 | /* dmalloc provides variants of these that do abort() on failure.
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| 20 | * Since dmalloc's prototypes overwrite the impls here as they are
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| 21 | * included after these prototypes in libbb.h, all is well.
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| 22 | */
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| 23 | // Warn if we can't allocate size bytes of memory.
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| 24 | void *malloc_or_warn(size_t size)
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| 25 | {
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| 26 | void *ptr = malloc(size);
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| 27 | if (ptr == NULL && size != 0)
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| 28 | bb_error_msg(bb_msg_memory_exhausted);
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| 29 | return ptr;
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| 30 | }
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| 31 |
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| 32 | // Die if we can't allocate size bytes of memory.
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[821] | 33 | void *xmalloc(size_t size)
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| 34 | {
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| 35 | void *ptr = malloc(size);
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| 36 | if (ptr == NULL && size != 0)
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| 37 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 38 | return ptr;
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| 39 | }
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| 40 |
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[1765] | 41 | // Die if we can't resize previously allocated memory. (This returns a pointer
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| 42 | // to the new memory, which may or may not be the same as the old memory.
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| 43 | // It'll copy the contents to a new chunk and free the old one if necessary.)
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[821] | 44 | void *xrealloc(void *ptr, size_t size)
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| 45 | {
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| 46 | ptr = realloc(ptr, size);
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| 47 | if (ptr == NULL && size != 0)
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| 48 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 49 | return ptr;
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| 50 | }
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[1765] | 51 | #endif /* DMALLOC */
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[821] | 52 |
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[1765] | 53 | // Die if we can't allocate and zero size bytes of memory.
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[821] | 54 | void *xzalloc(size_t size)
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| 55 | {
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| 56 | void *ptr = xmalloc(size);
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| 57 | memset(ptr, 0, size);
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| 58 | return ptr;
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| 59 | }
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| 60 |
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[1765] | 61 | // Die if we can't copy a string to freshly allocated memory.
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| 62 | char * xstrdup(const char *s)
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[821] | 63 | {
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| 64 | char *t;
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| 65 |
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| 66 | if (s == NULL)
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| 67 | return NULL;
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| 68 |
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[1765] | 69 | t = strdup(s);
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[821] | 70 |
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| 71 | if (t == NULL)
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| 72 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 73 |
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| 74 | return t;
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| 75 | }
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| 76 |
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[1765] | 77 | // Die if we can't allocate n+1 bytes (space for the null terminator) and copy
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| 78 | // the (possibly truncated to length n) string into it.
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| 79 | char * xstrndup(const char *s, int n)
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[821] | 80 | {
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[1765] | 81 | int m;
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[821] | 82 | char *t;
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| 83 |
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| 84 | if (ENABLE_DEBUG && s == NULL)
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[1765] | 85 | bb_error_msg_and_die("xstrndup bug");
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[821] | 86 |
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[1765] | 87 | /* We can just xmalloc(n+1) and strncpy into it, */
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| 88 | /* but think about xstrndup("abc", 10000) wastage! */
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| 89 | m = n;
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| 90 | t = (char*) s;
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| 91 | while (m) {
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| 92 | if (!*t) break;
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| 93 | m--;
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| 94 | t++;
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| 95 | }
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| 96 | n -= m;
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| 97 | t = xmalloc(n + 1);
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| 98 | t[n] = '\0';
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[821] | 99 |
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[1765] | 100 | return memcpy(t, s, n);
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[821] | 101 | }
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| 102 |
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[1765] | 103 | // Die if we can't open a file and return a FILE * to it.
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| 104 | // Notice we haven't got xfread(), This is for use with fscanf() and friends.
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| 105 | FILE *xfopen(const char *path, const char *mode)
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[821] | 106 | {
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[1765] | 107 | FILE *fp = fopen(path, mode);
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| 108 | if (fp == NULL)
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| 109 | bb_perror_msg_and_die("can't open '%s'", path);
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[821] | 110 | return fp;
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| 111 | }
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| 112 |
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[1765] | 113 | // Die if we can't open a file and return a fd.
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| 114 | int xopen3(const char *pathname, int flags, int mode)
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[821] | 115 | {
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[1765] | 116 | int ret;
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| 117 |
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| 118 | ret = open(pathname, flags, mode);
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| 119 | if (ret < 0) {
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| 120 | bb_perror_msg_and_die("can't open '%s'", pathname);
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| 121 | }
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| 122 | return ret;
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[821] | 123 | }
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| 124 |
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[1765] | 125 | // Die if we can't open an existing file and return a fd.
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| 126 | int xopen(const char *pathname, int flags)
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[821] | 127 | {
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[1765] | 128 | return xopen3(pathname, flags, 0666);
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| 129 | }
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| 130 |
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| 131 | // Warn if we can't open a file and return a fd.
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| 132 | int open3_or_warn(const char *pathname, int flags, int mode)
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| 133 | {
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[821] | 134 | int ret;
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| 135 |
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| 136 | ret = open(pathname, flags, mode);
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| 137 | if (ret < 0) {
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[1765] | 138 | bb_perror_msg("can't open '%s'", pathname);
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[821] | 139 | }
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| 140 | return ret;
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| 141 | }
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| 142 |
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[1765] | 143 | // Warn if we can't open a file and return a fd.
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| 144 | int open_or_warn(const char *pathname, int flags)
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[821] | 145 | {
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[1765] | 146 | return open3_or_warn(pathname, flags, 0666);
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| 147 | }
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[821] | 148 |
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[1765] | 149 | void xpipe(int filedes[2])
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| 150 | {
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| 151 | if (pipe(filedes))
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| 152 | bb_perror_msg_and_die("can't create pipe");
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| 153 | }
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| 154 |
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| 155 | void xunlink(const char *pathname)
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| 156 | {
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| 157 | if (unlink(pathname))
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| 158 | bb_perror_msg_and_die("can't remove file '%s'", pathname);
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| 159 | }
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| 160 |
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| 161 | // Turn on nonblocking I/O on a fd
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| 162 | int ndelay_on(int fd)
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| 163 | {
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| 164 | return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) | O_NONBLOCK);
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| 165 | }
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| 166 |
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| 167 | int ndelay_off(int fd)
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| 168 | {
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| 169 | return fcntl(fd, F_SETFL, fcntl(fd,F_GETFL) & ~O_NONBLOCK);
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| 170 | }
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| 171 |
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| 172 | void xdup2(int from, int to)
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| 173 | {
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| 174 | if (dup2(from, to) != to)
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| 175 | bb_perror_msg_and_die("can't duplicate file descriptor");
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| 176 | }
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| 177 |
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| 178 | // "Renumber" opened fd
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| 179 | void xmove_fd(int from, int to)
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| 180 | {
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| 181 | if (from == to)
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| 182 | return;
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| 183 | xdup2(from, to);
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| 184 | close(from);
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| 185 | }
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| 186 |
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| 187 | // Die with an error message if we can't write the entire buffer.
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| 188 | void xwrite(int fd, const void *buf, size_t count)
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| 189 | {
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| 190 | if (count) {
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| 191 | ssize_t size = full_write(fd, buf, count);
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| 192 | if (size != count)
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| 193 | bb_error_msg_and_die("short write");
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[821] | 194 | }
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| 195 | }
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[1765] | 196 |
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| 197 | // Die with an error message if we can't lseek to the right spot.
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| 198 | off_t xlseek(int fd, off_t offset, int whence)
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| 199 | {
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| 200 | off_t off = lseek(fd, offset, whence);
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| 201 | if (off == (off_t)-1) {
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| 202 | if (whence == SEEK_SET)
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| 203 | bb_perror_msg_and_die("lseek(%"OFF_FMT"u)", offset);
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| 204 | bb_perror_msg_and_die("lseek");
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| 205 | }
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| 206 | return off;
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| 207 | }
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| 208 |
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| 209 | // Die with supplied filename if this FILE * has ferror set.
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| 210 | void die_if_ferror(FILE *fp, const char *fn)
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| 211 | {
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| 212 | if (ferror(fp)) {
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| 213 | /* ferror doesn't set useful errno */
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| 214 | bb_error_msg_and_die("%s: I/O error", fn);
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| 215 | }
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| 216 | }
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| 217 |
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| 218 | // Die with an error message if stdout has ferror set.
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| 219 | void die_if_ferror_stdout(void)
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| 220 | {
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| 221 | die_if_ferror(stdout, bb_msg_standard_output);
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| 222 | }
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| 223 |
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| 224 | // Die with an error message if we have trouble flushing stdout.
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| 225 | void xfflush_stdout(void)
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| 226 | {
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| 227 | if (fflush(stdout)) {
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| 228 | bb_perror_msg_and_die(bb_msg_standard_output);
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| 229 | }
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| 230 | }
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| 231 |
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| 232 | void sig_block(int sig)
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| 233 | {
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| 234 | sigset_t ss;
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| 235 | sigemptyset(&ss);
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| 236 | sigaddset(&ss, sig);
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| 237 | sigprocmask(SIG_BLOCK, &ss, NULL);
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| 238 | }
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| 239 |
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| 240 | void sig_unblock(int sig)
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| 241 | {
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| 242 | sigset_t ss;
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| 243 | sigemptyset(&ss);
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| 244 | sigaddset(&ss, sig);
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| 245 | sigprocmask(SIG_UNBLOCK, &ss, NULL);
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| 246 | }
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| 247 |
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| 248 | #if 0
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| 249 | void sig_blocknone(void)
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| 250 | {
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| 251 | sigset_t ss;
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| 252 | sigemptyset(&ss);
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| 253 | sigprocmask(SIG_SETMASK, &ss, NULL);
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| 254 | }
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[821] | 255 | #endif
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| 256 |
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[1765] | 257 | void sig_catch(int sig, void (*f)(int))
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[821] | 258 | {
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[1765] | 259 | struct sigaction sa;
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| 260 | sa.sa_handler = f;
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| 261 | sa.sa_flags = 0;
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| 262 | sigemptyset(&sa.sa_mask);
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| 263 | sigaction(sig, &sa, NULL);
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| 264 | }
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[821] | 265 |
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[1765] | 266 | void sig_pause(void)
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| 267 | {
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| 268 | sigset_t ss;
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| 269 | sigemptyset(&ss);
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| 270 | sigsuspend(&ss);
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| 271 | }
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| 272 |
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| 273 |
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| 274 | void xsetenv(const char *key, const char *value)
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| 275 | {
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| 276 | if (setenv(key, value, 1))
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| 277 | bb_error_msg_and_die(bb_msg_memory_exhausted);
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| 278 | }
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| 279 |
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| 280 | // Converts unsigned long long value into compact 4-char
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| 281 | // representation. Examples: "1234", "1.2k", " 27M", "123T"
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| 282 | // Fifth char is always '\0'
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| 283 | void smart_ulltoa5(unsigned long long ul, char buf[5])
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| 284 | {
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| 285 | const char *fmt;
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| 286 | char c;
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| 287 | unsigned v,idx = 0;
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| 288 | ul *= 10;
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| 289 | if (ul > 9999*10) { // do not scale if 9999 or less
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| 290 | while (ul >= 10000) {
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| 291 | ul /= 1024;
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| 292 | idx++;
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[821] | 293 | }
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| 294 | }
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[1765] | 295 | v = ul; // ullong divisions are expensive, avoid them
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| 296 |
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| 297 | fmt = " 123456789";
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| 298 | if (!idx) { // 9999 or less: use 1234 format
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| 299 | c = buf[0] = " 123456789"[v/10000];
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| 300 | if (c != ' ') fmt = "0123456789";
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| 301 | c = buf[1] = fmt[v/1000%10];
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| 302 | if (c != ' ') fmt = "0123456789";
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| 303 | buf[2] = fmt[v/100%10];
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| 304 | buf[3] = "0123456789"[v/10%10];
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| 305 | } else {
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| 306 | if (v >= 10*10) { // scaled value is >=10: use 123M format
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| 307 | c = buf[0] = " 123456789"[v/1000];
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| 308 | if (c != ' ') fmt = "0123456789";
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| 309 | buf[1] = fmt[v/100%10];
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| 310 | buf[2] = "0123456789"[v/10%10];
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| 311 | } else { // scaled value is <10: use 1.2M format
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| 312 | buf[0] = "0123456789"[v/10];
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| 313 | buf[1] = '.';
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| 314 | buf[2] = "0123456789"[v%10];
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| 315 | }
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| 316 | // see http://en.wikipedia.org/wiki/Tera
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| 317 | buf[3] = " kMGTPEZY"[idx];
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| 318 | }
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| 319 | buf[4] = '\0';
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[821] | 320 | }
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| 321 |
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[1765] | 322 | // Convert unsigned integer to ascii, writing into supplied buffer.
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| 323 | // A truncated result contains the first few digits of the result ala strncpy.
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| 324 | // Returns a pointer past last generated digit, does _not_ store NUL.
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| 325 | void BUG_sizeof_unsigned_not_4(void);
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| 326 | char *utoa_to_buf(unsigned n, char *buf, unsigned buflen)
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[821] | 327 | {
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[1765] | 328 | unsigned i, out, res;
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| 329 | if (sizeof(unsigned) != 4)
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| 330 | BUG_sizeof_unsigned_not_4();
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| 331 | if (buflen) {
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| 332 | out = 0;
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| 333 | for (i = 1000000000; i; i /= 10) {
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| 334 | res = n / i;
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| 335 | if (res || out || i == 1) {
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| 336 | if (!--buflen) break;
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| 337 | out++;
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| 338 | n -= res*i;
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| 339 | *buf++ = '0' + res;
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| 340 | }
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| 341 | }
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| 342 | }
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| 343 | return buf;
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| 344 | }
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[821] | 345 |
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[1765] | 346 | // Convert signed integer to ascii, like utoa_to_buf()
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| 347 | char *itoa_to_buf(int n, char *buf, unsigned buflen)
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| 348 | {
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| 349 | if (buflen && n<0) {
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| 350 | n = -n;
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| 351 | *buf++ = '-';
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| 352 | buflen--;
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| 353 | }
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| 354 | return utoa_to_buf((unsigned)n, buf, buflen);
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| 355 | }
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[821] | 356 |
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[1765] | 357 | // The following two functions use a static buffer, so calling either one a
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| 358 | // second time will overwrite previous results.
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| 359 | //
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| 360 | // The largest 32 bit integer is -2 billion plus null terminator, or 12 bytes.
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| 361 | // Int should always be 32 bits on any remotely Unix-like system, see
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| 362 | // http://www.unix.org/whitepapers/64bit.html for the reasons why.
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| 363 |
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| 364 | static char local_buf[12];
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| 365 |
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| 366 | // Convert unsigned integer to ascii using a static buffer (returned).
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| 367 | char *utoa(unsigned n)
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| 368 | {
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| 369 | *(utoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
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| 370 |
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| 371 | return local_buf;
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[821] | 372 | }
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| 373 |
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[1765] | 374 | // Convert signed integer to ascii using a static buffer (returned).
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| 375 | char *itoa(int n)
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[821] | 376 | {
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[1765] | 377 | *(itoa_to_buf(n, local_buf, sizeof(local_buf))) = '\0';
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| 378 |
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| 379 | return local_buf;
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| 380 | }
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| 381 |
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| 382 | // Emit a string of hex representation of bytes
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| 383 | char *bin2hex(char *p, const char *cp, int count)
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| 384 | {
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| 385 | while (count) {
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| 386 | unsigned char c = *cp++;
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| 387 | /* put lowercase hex digits */
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| 388 | *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
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| 389 | *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
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| 390 | count--;
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[821] | 391 | }
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[1765] | 392 | return p;
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[821] | 393 | }
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| 394 |
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[1765] | 395 | // Die with an error message if we can't set gid. (Because resource limits may
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| 396 | // limit this user to a given number of processes, and if that fills up the
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| 397 | // setgid() will fail and we'll _still_be_root_, which is bad.)
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| 398 | void xsetgid(gid_t gid)
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[821] | 399 | {
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[1765] | 400 | if (setgid(gid)) bb_perror_msg_and_die("setgid");
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[821] | 401 | }
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[1765] | 402 |
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| 403 | // Die with an error message if we can't set uid. (See xsetgid() for why.)
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| 404 | void xsetuid(uid_t uid)
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| 405 | {
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| 406 | if (setuid(uid)) bb_perror_msg_and_die("setuid");
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| 407 | }
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| 408 |
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| 409 | // Return how long the file at fd is, if there's any way to determine it.
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| 410 | off_t fdlength(int fd)
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| 411 | {
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| 412 | off_t bottom = 0, top = 0, pos;
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| 413 | long size;
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| 414 |
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| 415 | // If the ioctl works for this, return it.
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| 416 |
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| 417 | if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
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| 418 |
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| 419 | // FIXME: explain why lseek(SEEK_END) is not used here!
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| 420 |
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| 421 | // If not, do a binary search for the last location we can read. (Some
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| 422 | // block devices don't do BLKGETSIZE right.)
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| 423 |
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| 424 | do {
|
---|
| 425 | char temp;
|
---|
| 426 |
|
---|
| 427 | pos = bottom + (top - bottom) / 2;
|
---|
| 428 |
|
---|
| 429 | // If we can read from the current location, it's bigger.
|
---|
| 430 |
|
---|
| 431 | if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
|
---|
| 432 | if (bottom == top) bottom = top = (top+1) * 2;
|
---|
| 433 | else bottom = pos;
|
---|
| 434 |
|
---|
| 435 | // If we can't, it's smaller.
|
---|
| 436 |
|
---|
| 437 | } else {
|
---|
| 438 | if (bottom == top) {
|
---|
| 439 | if (!top) return 0;
|
---|
| 440 | bottom = top/2;
|
---|
| 441 | }
|
---|
| 442 | else top = pos;
|
---|
| 443 | }
|
---|
| 444 | } while (bottom + 1 != top);
|
---|
| 445 |
|
---|
| 446 | return pos + 1;
|
---|
| 447 | }
|
---|
| 448 |
|
---|
| 449 | // Die with an error message if we can't malloc() enough space and do an
|
---|
| 450 | // sprintf() into that space.
|
---|
| 451 | char *xasprintf(const char *format, ...)
|
---|
| 452 | {
|
---|
| 453 | va_list p;
|
---|
| 454 | int r;
|
---|
| 455 | char *string_ptr;
|
---|
| 456 |
|
---|
| 457 | #if 1
|
---|
| 458 | // GNU extension
|
---|
| 459 | va_start(p, format);
|
---|
| 460 | r = vasprintf(&string_ptr, format, p);
|
---|
| 461 | va_end(p);
|
---|
| 462 | #else
|
---|
| 463 | // Bloat for systems that haven't got the GNU extension.
|
---|
| 464 | va_start(p, format);
|
---|
| 465 | r = vsnprintf(NULL, 0, format, p);
|
---|
| 466 | va_end(p);
|
---|
| 467 | string_ptr = xmalloc(r+1);
|
---|
| 468 | va_start(p, format);
|
---|
| 469 | r = vsnprintf(string_ptr, r+1, format, p);
|
---|
| 470 | va_end(p);
|
---|
[821] | 471 | #endif
|
---|
| 472 |
|
---|
[1765] | 473 | if (r < 0) bb_error_msg_and_die(bb_msg_memory_exhausted);
|
---|
| 474 | return string_ptr;
|
---|
| 475 | }
|
---|
| 476 |
|
---|
| 477 | #if 0 /* If we will ever meet a libc which hasn't [f]dprintf... */
|
---|
| 478 | int fdprintf(int fd, const char *format, ...)
|
---|
[821] | 479 | {
|
---|
[1765] | 480 | va_list p;
|
---|
| 481 | int r;
|
---|
| 482 | char *string_ptr;
|
---|
| 483 |
|
---|
| 484 | #if 1
|
---|
| 485 | // GNU extension
|
---|
| 486 | va_start(p, format);
|
---|
| 487 | r = vasprintf(&string_ptr, format, p);
|
---|
| 488 | va_end(p);
|
---|
| 489 | #else
|
---|
| 490 | // Bloat for systems that haven't got the GNU extension.
|
---|
| 491 | va_start(p, format);
|
---|
| 492 | r = vsnprintf(NULL, 0, format, p) + 1;
|
---|
| 493 | va_end(p);
|
---|
| 494 | string_ptr = malloc(r);
|
---|
| 495 | if (string_ptr) {
|
---|
| 496 | va_start(p, format);
|
---|
| 497 | r = vsnprintf(string_ptr, r, format, p);
|
---|
| 498 | va_end(p);
|
---|
[821] | 499 | }
|
---|
[1765] | 500 | #endif
|
---|
| 501 |
|
---|
| 502 | if (r >= 0) {
|
---|
| 503 | full_write(fd, string_ptr, r);
|
---|
| 504 | free(string_ptr);
|
---|
| 505 | }
|
---|
| 506 | return r;
|
---|
[821] | 507 | }
|
---|
| 508 | #endif
|
---|
| 509 |
|
---|
[1765] | 510 | // Die with an error message if we can't copy an entire FILE * to stdout, then
|
---|
| 511 | // close that file.
|
---|
| 512 | void xprint_and_close_file(FILE *file)
|
---|
[821] | 513 | {
|
---|
[1765] | 514 | fflush(stdout);
|
---|
| 515 | // copyfd outputs error messages for us.
|
---|
| 516 | if (bb_copyfd_eof(fileno(file), 1) == -1)
|
---|
| 517 | xfunc_die();
|
---|
[821] | 518 |
|
---|
[1765] | 519 | fclose(file);
|
---|
| 520 | }
|
---|
[821] | 521 |
|
---|
[1765] | 522 | // Die if we can't chdir to a new path.
|
---|
| 523 | void xchdir(const char *path)
|
---|
| 524 | {
|
---|
| 525 | if (chdir(path))
|
---|
| 526 | bb_perror_msg_and_die("chdir(%s)", path);
|
---|
| 527 | }
|
---|
[821] | 528 |
|
---|
[1765] | 529 | // Print a warning message if opendir() fails, but don't die.
|
---|
| 530 | DIR *warn_opendir(const char *path)
|
---|
| 531 | {
|
---|
| 532 | DIR *dp;
|
---|
| 533 |
|
---|
| 534 | dp = opendir(path);
|
---|
| 535 | if (!dp)
|
---|
| 536 | bb_perror_msg("can't open '%s'", path);
|
---|
| 537 | return dp;
|
---|
[821] | 538 | }
|
---|
[1765] | 539 |
|
---|
| 540 | // Die with an error message if opendir() fails.
|
---|
| 541 | DIR *xopendir(const char *path)
|
---|
| 542 | {
|
---|
| 543 | DIR *dp;
|
---|
| 544 |
|
---|
| 545 | dp = opendir(path);
|
---|
| 546 | if (!dp)
|
---|
| 547 | bb_perror_msg_and_die("can't open '%s'", path);
|
---|
| 548 | return dp;
|
---|
| 549 | }
|
---|
| 550 |
|
---|
| 551 | // Die with an error message if we can't open a new socket.
|
---|
| 552 | int xsocket(int domain, int type, int protocol)
|
---|
| 553 | {
|
---|
| 554 | int r = socket(domain, type, protocol);
|
---|
| 555 |
|
---|
| 556 | if (r < 0) {
|
---|
| 557 | /* Hijack vaguely related config option */
|
---|
| 558 | #if ENABLE_VERBOSE_RESOLUTION_ERRORS
|
---|
| 559 | const char *s = "INET";
|
---|
| 560 | if (domain == AF_PACKET) s = "PACKET";
|
---|
| 561 | if (domain == AF_NETLINK) s = "NETLINK";
|
---|
| 562 | USE_FEATURE_IPV6(if (domain == AF_INET6) s = "INET6";)
|
---|
| 563 | bb_perror_msg_and_die("socket(AF_%s)", s);
|
---|
| 564 | #else
|
---|
| 565 | bb_perror_msg_and_die("socket");
|
---|
[821] | 566 | #endif
|
---|
[1765] | 567 | }
|
---|
[821] | 568 |
|
---|
[1765] | 569 | return r;
|
---|
| 570 | }
|
---|
| 571 |
|
---|
| 572 | // Die with an error message if we can't bind a socket to an address.
|
---|
| 573 | void xbind(int sockfd, struct sockaddr *my_addr, socklen_t addrlen)
|
---|
[821] | 574 | {
|
---|
[1765] | 575 | if (bind(sockfd, my_addr, addrlen)) bb_perror_msg_and_die("bind");
|
---|
[821] | 576 | }
|
---|
[1765] | 577 |
|
---|
| 578 | // Die with an error message if we can't listen for connections on a socket.
|
---|
| 579 | void xlisten(int s, int backlog)
|
---|
| 580 | {
|
---|
| 581 | if (listen(s, backlog)) bb_perror_msg_and_die("listen");
|
---|
| 582 | }
|
---|
| 583 |
|
---|
| 584 | /* Die with an error message if sendto failed.
|
---|
| 585 | * Return bytes sent otherwise */
|
---|
| 586 | ssize_t xsendto(int s, const void *buf, size_t len, const struct sockaddr *to,
|
---|
| 587 | socklen_t tolen)
|
---|
| 588 | {
|
---|
| 589 | ssize_t ret = sendto(s, buf, len, 0, to, tolen);
|
---|
| 590 | if (ret < 0) {
|
---|
| 591 | if (ENABLE_FEATURE_CLEAN_UP)
|
---|
| 592 | close(s);
|
---|
| 593 | bb_perror_msg_and_die("sendto");
|
---|
| 594 | }
|
---|
| 595 | return ret;
|
---|
| 596 | }
|
---|
| 597 |
|
---|
| 598 | // xstat() - a stat() which dies on failure with meaningful error message
|
---|
| 599 | void xstat(const char *name, struct stat *stat_buf)
|
---|
| 600 | {
|
---|
| 601 | if (stat(name, stat_buf))
|
---|
| 602 | bb_perror_msg_and_die("can't stat '%s'", name);
|
---|
| 603 | }
|
---|
| 604 |
|
---|
| 605 | // selinux_or_die() - die if SELinux is disabled.
|
---|
| 606 | void selinux_or_die(void)
|
---|
| 607 | {
|
---|
| 608 | #if ENABLE_SELINUX
|
---|
| 609 | int rc = is_selinux_enabled();
|
---|
| 610 | if (rc == 0) {
|
---|
| 611 | bb_error_msg_and_die("SELinux is disabled");
|
---|
| 612 | } else if (rc < 0) {
|
---|
| 613 | bb_error_msg_and_die("is_selinux_enabled() failed");
|
---|
| 614 | }
|
---|
| 615 | #else
|
---|
| 616 | bb_error_msg_and_die("SELinux support is disabled");
|
---|
[821] | 617 | #endif
|
---|
[1765] | 618 | }
|
---|
[821] | 619 |
|
---|
[1765] | 620 | /* It is perfectly ok to pass in a NULL for either width or for
|
---|
| 621 | * height, in which case that value will not be set. */
|
---|
| 622 | int get_terminal_width_height(int fd, int *width, int *height)
|
---|
[821] | 623 | {
|
---|
[1765] | 624 | struct winsize win = { 0, 0, 0, 0 };
|
---|
| 625 | int ret = ioctl(fd, TIOCGWINSZ, &win);
|
---|
[821] | 626 |
|
---|
[1765] | 627 | if (height) {
|
---|
| 628 | if (!win.ws_row) {
|
---|
| 629 | char *s = getenv("LINES");
|
---|
| 630 | if (s) win.ws_row = atoi(s);
|
---|
| 631 | }
|
---|
| 632 | if (win.ws_row <= 1 || win.ws_row >= 30000)
|
---|
| 633 | win.ws_row = 24;
|
---|
| 634 | *height = (int) win.ws_row;
|
---|
| 635 | }
|
---|
| 636 |
|
---|
| 637 | if (width) {
|
---|
| 638 | if (!win.ws_col) {
|
---|
| 639 | char *s = getenv("COLUMNS");
|
---|
| 640 | if (s) win.ws_col = atoi(s);
|
---|
| 641 | }
|
---|
| 642 | if (win.ws_col <= 1 || win.ws_col >= 30000)
|
---|
| 643 | win.ws_col = 80;
|
---|
| 644 | *width = (int) win.ws_col;
|
---|
| 645 | }
|
---|
| 646 |
|
---|
| 647 | return ret;
|
---|
[821] | 648 | }
|
---|
| 649 |
|
---|
[1765] | 650 | void ioctl_or_perror_and_die(int fd, int request, void *argp, const char *fmt,...)
|
---|
[821] | 651 | {
|
---|
[1765] | 652 | va_list p;
|
---|
| 653 |
|
---|
| 654 | if (ioctl(fd, request, argp) < 0) {
|
---|
| 655 | va_start(p, fmt);
|
---|
| 656 | bb_verror_msg(fmt, p, strerror(errno));
|
---|
| 657 | /* xfunc_die can actually longjmp, so be nice */
|
---|
| 658 | va_end(p);
|
---|
| 659 | xfunc_die();
|
---|
| 660 | }
|
---|
[821] | 661 | }
|
---|
| 662 |
|
---|
[1765] | 663 | int ioctl_or_perror(int fd, int request, void *argp, const char *fmt,...)
|
---|
[821] | 664 | {
|
---|
[1765] | 665 | va_list p;
|
---|
| 666 | int ret = ioctl(fd, request, argp);
|
---|
| 667 |
|
---|
| 668 | if (ret < 0) {
|
---|
| 669 | va_start(p, fmt);
|
---|
| 670 | bb_verror_msg(fmt, p, strerror(errno));
|
---|
| 671 | va_end(p);
|
---|
| 672 | }
|
---|
| 673 | return ret;
|
---|
[821] | 674 | }
|
---|
[1765] | 675 |
|
---|
| 676 | #if ENABLE_IOCTL_HEX2STR_ERROR
|
---|
| 677 | int bb_ioctl_or_warn(int fd, int request, void *argp, const char *ioctl_name)
|
---|
| 678 | {
|
---|
| 679 | int ret;
|
---|
| 680 |
|
---|
| 681 | ret = ioctl(fd, request, argp);
|
---|
| 682 | if (ret < 0)
|
---|
| 683 | bb_perror_msg("%s", ioctl_name);
|
---|
| 684 | return ret;
|
---|
| 685 | }
|
---|
| 686 | void bb_xioctl(int fd, int request, void *argp, const char *ioctl_name)
|
---|
| 687 | {
|
---|
| 688 | if (ioctl(fd, request, argp) < 0)
|
---|
| 689 | bb_perror_msg_and_die("%s", ioctl_name);
|
---|
| 690 | }
|
---|
| 691 | #else
|
---|
| 692 | int bb_ioctl_or_warn(int fd, int request, void *argp)
|
---|
| 693 | {
|
---|
| 694 | int ret;
|
---|
| 695 |
|
---|
| 696 | ret = ioctl(fd, request, argp);
|
---|
| 697 | if (ret < 0)
|
---|
| 698 | bb_perror_msg("ioctl %#x failed", request);
|
---|
| 699 | return ret;
|
---|
| 700 | }
|
---|
| 701 | void bb_xioctl(int fd, int request, void *argp)
|
---|
| 702 | {
|
---|
| 703 | if (ioctl(fd, request, argp) < 0)
|
---|
| 704 | bb_perror_msg_and_die("ioctl %#x failed", request);
|
---|
| 705 | }
|
---|
[821] | 706 | #endif
|
---|