[2725] | 1 | /*
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| 2 | * Replacements for common but usually nonstandard functions that aren't
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| 3 | * supplied by all platforms.
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| 4 | *
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| 5 | * Copyright (C) 2009 by Dan Fandrich <dan@coneharvesters.com>, et. al.
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| 6 | *
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| 7 | * Licensed under GPLv2, see file LICENSE in this source tree.
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| 8 | */
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| 9 | #include "libbb.h"
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| 10 |
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| 11 | #ifndef HAVE_STRCHRNUL
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| 12 | char* FAST_FUNC strchrnul(const char *s, int c)
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| 13 | {
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| 14 | while (*s != '\0' && *s != c)
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| 15 | s++;
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| 16 | return (char*)s;
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| 17 | }
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| 18 | #endif
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| 19 |
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[3621] | 20 | #ifndef HAVE_USLEEP
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| 21 | int FAST_FUNC usleep(unsigned usec)
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| 22 | {
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| 23 | struct timespec ts;
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| 24 | ts.tv_sec = usec / 1000000u;
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| 25 | ts.tv_nsec = (usec % 1000000u) * 1000u;
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| 26 | /*
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| 27 | * If a signal has non-default handler, nanosleep returns early.
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| 28 | * Our version of usleep doesn't return early
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| 29 | * if interrupted by such signals:
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| 30 | *
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| 31 | */
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| 32 | while (nanosleep(&ts, &ts) != 0)
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| 33 | continue;
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| 34 | return 0;
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| 35 | }
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| 36 | #endif
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| 37 |
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[2725] | 38 | #ifndef HAVE_VASPRINTF
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| 39 | int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
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| 40 | {
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| 41 | int r;
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| 42 | va_list p2;
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| 43 | char buf[128];
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| 44 |
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| 45 | va_copy(p2, p);
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| 46 | r = vsnprintf(buf, 128, format, p);
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| 47 | va_end(p);
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| 48 |
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[3621] | 49 | /* Note: can't use xstrdup/xmalloc, they call vasprintf (us) on failure! */
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| 50 |
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[2725] | 51 | if (r < 128) {
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| 52 | va_end(p2);
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[3621] | 53 | *string_ptr = strdup(buf);
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| 54 | return (*string_ptr ? r : -1);
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[2725] | 55 | }
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| 56 |
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[3621] | 57 | *string_ptr = malloc(r+1);
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| 58 | r = (*string_ptr ? vsnprintf(*string_ptr, r+1, format, p2) : -1);
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[2725] | 59 | va_end(p2);
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| 60 |
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| 61 | return r;
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| 62 | }
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| 63 | #endif
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| 64 |
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[3232] | 65 | #ifndef HAVE_DPRINTF
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| 66 | /* dprintf is now part of POSIX.1, but was only added in 2008 */
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| 67 | int dprintf(int fd, const char *format, ...)
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[2725] | 68 | {
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| 69 | va_list p;
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| 70 | int r;
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| 71 | char *string_ptr;
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| 72 |
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| 73 | va_start(p, format);
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| 74 | r = vasprintf(&string_ptr, format, p);
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| 75 | va_end(p);
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| 76 | if (r >= 0) {
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| 77 | r = full_write(fd, string_ptr, r);
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| 78 | free(string_ptr);
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| 79 | }
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| 80 | return r;
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| 81 | }
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| 82 | #endif
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| 83 |
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| 84 | #ifndef HAVE_MEMRCHR
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| 85 | /* Copyright (C) 2005 Free Software Foundation, Inc.
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| 86 | * memrchr() is a GNU function that might not be available everywhere.
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| 87 | * It's basically the inverse of memchr() - search backwards in a
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| 88 | * memory block for a particular character.
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| 89 | */
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| 90 | void* FAST_FUNC memrchr(const void *s, int c, size_t n)
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| 91 | {
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| 92 | const char *start = s, *end = s;
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| 93 |
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| 94 | end += n - 1;
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| 95 |
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| 96 | while (end >= start) {
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| 97 | if (*end == (char)c)
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| 98 | return (void *) end;
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| 99 | end--;
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| 100 | }
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| 101 |
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| 102 | return NULL;
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| 103 | }
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| 104 | #endif
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| 105 |
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| 106 | #ifndef HAVE_MKDTEMP
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| 107 | /* This is now actually part of POSIX.1, but was only added in 2008 */
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| 108 | char* FAST_FUNC mkdtemp(char *template)
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| 109 | {
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| 110 | if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
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| 111 | return NULL;
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| 112 | return template;
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| 113 | }
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| 114 | #endif
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| 115 |
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| 116 | #ifndef HAVE_STRCASESTR
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| 117 | /* Copyright (c) 1999, 2000 The ht://Dig Group */
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| 118 | char* FAST_FUNC strcasestr(const char *s, const char *pattern)
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| 119 | {
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| 120 | int length = strlen(pattern);
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| 121 |
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| 122 | while (*s) {
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| 123 | if (strncasecmp(s, pattern, length) == 0)
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| 124 | return (char *)s;
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| 125 | s++;
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| 126 | }
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| 127 | return 0;
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| 128 | }
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| 129 | #endif
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| 130 |
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| 131 | #ifndef HAVE_STRSEP
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| 132 | /* Copyright (C) 2004 Free Software Foundation, Inc. */
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| 133 | char* FAST_FUNC strsep(char **stringp, const char *delim)
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| 134 | {
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| 135 | char *start = *stringp;
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| 136 | char *ptr;
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| 137 |
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| 138 | if (!start)
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| 139 | return NULL;
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| 140 |
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| 141 | if (!*delim)
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| 142 | ptr = start + strlen(start);
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| 143 | else {
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| 144 | ptr = strpbrk(start, delim);
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| 145 | if (!ptr) {
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| 146 | *stringp = NULL;
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| 147 | return start;
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| 148 | }
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| 149 | }
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| 150 |
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| 151 | *ptr = '\0';
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| 152 | *stringp = ptr + 1;
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| 153 |
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| 154 | return start;
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| 155 | }
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| 156 | #endif
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[3232] | 157 |
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| 158 | #ifndef HAVE_STPCPY
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| 159 | char* FAST_FUNC stpcpy(char *p, const char *to_add)
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| 160 | {
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| 161 | while ((*p = *to_add) != '\0') {
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| 162 | p++;
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| 163 | to_add++;
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| 164 | }
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| 165 | return p;
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| 166 | }
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| 167 | #endif
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| 168 |
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| 169 | #ifndef HAVE_GETLINE
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| 170 | ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
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| 171 | {
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| 172 | int ch;
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| 173 | char *line = *lineptr;
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| 174 | size_t alloced = *n;
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| 175 | size_t len = 0;
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| 176 |
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| 177 | do {
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| 178 | ch = fgetc(stream);
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| 179 | if (ch == EOF)
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| 180 | break;
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| 181 | if (len + 1 >= alloced) {
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| 182 | alloced += alloced/4 + 64;
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| 183 | line = xrealloc(line, alloced);
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| 184 | }
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| 185 | line[len++] = ch;
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| 186 | } while (ch != '\n');
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| 187 |
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| 188 | if (len == 0)
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| 189 | return -1;
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| 190 |
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| 191 | line[len] = '\0';
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| 192 | *lineptr = line;
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| 193 | *n = alloced;
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| 194 | return len;
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| 195 | }
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| 196 | #endif
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[3621] | 197 |
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| 198 | #ifndef HAVE_TTYNAME_R
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| 199 | int ttyname_r(int fd, char *buf, size_t buflen)
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| 200 | {
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| 201 | int r;
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| 202 | char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];
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| 203 |
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| 204 | if (!isatty(fd))
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| 205 | return errno == EINVAL ? ENOTTY : errno;
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| 206 | sprintf(path, "/proc/self/fd/%d", fd);
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| 207 | r = readlink(path, buf, buflen);
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| 208 | if (r < 0)
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| 209 | return errno;
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| 210 | if (r >= buflen)
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| 211 | return ERANGE;
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| 212 | buf[r] = '\0';
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| 213 | return 0;
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| 214 | }
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| 215 | #endif
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