source: branches/3.2/mindi-busybox/libbb/xfuncs.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 7.0 KB
RevLine 
[821]1/* vi: set sw=4 ts=4: */
2/*
3 * Utility routines.
4 *
5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
[1765]6 * Copyright (C) 2006 Rob Landley
[2725]7 * Copyright (C) 2006 Denys Vlasenko
[821]8 *
[2725]9 * Licensed under GPLv2, see file LICENSE in this source tree.
[821]10 */
11
[2725]12/* We need to have separate xfuncs.c and xfuncs_printf.c because
13 * with current linkers, even with section garbage collection,
14 * if *.o module references any of XXXprintf functions, you pull in
15 * entire printf machinery. Even if you do not use the function
16 * which uses XXXprintf.
17 *
18 * xfuncs.c contains functions (not necessarily xfuncs)
19 * which do not pull in printf, directly or indirectly.
20 * xfunc_printf.c contains those which do.
21 *
22 * TODO: move xmalloc() and xatonum() here.
[1765]23 */
24
[2725]25#include "libbb.h"
[821]26
[2725]27/* Turn on nonblocking I/O on a fd */
[3232]28void FAST_FUNC ndelay_on(int fd)
[821]29{
[3232]30    int flags = fcntl(fd, F_GETFL);
31    if (flags & O_NONBLOCK)
32        return;
33    fcntl(fd, F_SETFL, flags | O_NONBLOCK);
[821]34}
35
[3232]36void FAST_FUNC ndelay_off(int fd)
[821]37{
[3232]38    int flags = fcntl(fd, F_GETFL);
39    if (!(flags & O_NONBLOCK))
40        return;
41    fcntl(fd, F_SETFL, flags & ~O_NONBLOCK);
[821]42}
43
[3232]44void FAST_FUNC close_on_exec_on(int fd)
[821]45{
[3232]46    fcntl(fd, F_SETFD, FD_CLOEXEC);
[821]47}
48
[2725]49char* FAST_FUNC strncpy_IFNAMSIZ(char *dst, const char *src)
[821]50{
[2725]51#ifndef IFNAMSIZ
52    enum { IFNAMSIZ = 16 };
[821]53#endif
[2725]54    return strncpy(dst, src, IFNAMSIZ);
[1765]55}
[821]56
[1765]57
[2725]58/* Convert unsigned integer to ascii, writing into supplied buffer.
59 * A truncated result contains the first few digits of the result ala strncpy.
60 * Returns a pointer past last generated digit, does _not_ store NUL.
61 */
62void BUG_sizeof(void);
63char* FAST_FUNC utoa_to_buf(unsigned n, char *buf, unsigned buflen)
[1765]64{
[2725]65    unsigned i, out, res;
[1765]66
67    if (buflen) {
68        out = 0;
[2725]69        if (sizeof(n) == 4)
70        // 2^32-1 = 4294967295
71            i = 1000000000;
72#if UINT_MAX > 4294967295 /* prevents warning about "const too large" */
73        else
74        if (sizeof(n) == 8)
75        // 2^64-1 = 18446744073709551615
76            i = 10000000000000000000;
77#endif
78        else
79            BUG_sizeof();
80        for (; i; i /= 10) {
[1765]81            res = n / i;
[2725]82            n = n % i;
[1765]83            if (res || out || i == 1) {
[2725]84                if (--buflen == 0)
85                    break;
[1765]86                out++;
87                *buf++ = '0' + res;
88            }
89        }
90    }
91    return buf;
92}
[821]93
[2725]94/* Convert signed integer to ascii, like utoa_to_buf() */
95char* FAST_FUNC itoa_to_buf(int n, char *buf, unsigned buflen)
[1765]96{
[2725]97    if (!buflen)
98        return buf;
99    if (n < 0) {
[1765]100        n = -n;
101        *buf++ = '-';
102        buflen--;
103    }
104    return utoa_to_buf((unsigned)n, buf, buflen);
105}
[821]106
[1765]107// The following two functions use a static buffer, so calling either one a
108// second time will overwrite previous results.
109//
[2725]110// The largest 32 bit integer is -2 billion plus NUL, or 1+10+1=12 bytes.
111// It so happens that sizeof(int) * 3 is enough for 32+ bit ints.
112// (sizeof(int) * 3 + 2 is correct for any width, even 8-bit)
[1765]113
[2725]114static char local_buf[sizeof(int) * 3];
[1765]115
[2725]116/* Convert unsigned integer to ascii using a static buffer (returned). */
117char* FAST_FUNC utoa(unsigned n)
[1765]118{
[2725]119    *(utoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
[1765]120
121    return local_buf;
[821]122}
123
[2725]124/* Convert signed integer to ascii using a static buffer (returned). */
125char* FAST_FUNC itoa(int n)
[821]126{
[2725]127    *(itoa_to_buf(n, local_buf, sizeof(local_buf) - 1)) = '\0';
[1765]128
129    return local_buf;
130}
131
[2725]132/* Emit a string of hex representation of bytes */
133char* FAST_FUNC bin2hex(char *p, const char *cp, int count)
[1765]134{
135    while (count) {
136        unsigned char c = *cp++;
137        /* put lowercase hex digits */
138        *p++ = 0x20 | bb_hexdigits_upcase[c >> 4];
139        *p++ = 0x20 | bb_hexdigits_upcase[c & 0xf];
140        count--;
[821]141    }
[1765]142    return p;
[821]143}
144
[2725]145/* Convert "[x]x[:][x]x[:][x]x[:][x]x" hex string to binary, no more than COUNT bytes */
146char* FAST_FUNC hex2bin(char *dst, const char *str, int count)
[821]147{
[2725]148    errno = EINVAL;
149    while (*str && count) {
150        uint8_t val;
151        uint8_t c = *str++;
152        if (isdigit(c))
153            val = c - '0';
154        else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
155            val = (c|0x20) - ('a' - 10);
156        else
157            return NULL;
158        val <<= 4;
159        c = *str;
160        if (isdigit(c))
161            val |= c - '0';
162        else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
163            val |= (c|0x20) - ('a' - 10);
164        else if (c == ':' || c == '\0')
165            val >>= 4;
166        else
167            return NULL;
[1765]168
[2725]169        *dst++ = val;
170        if (c != '\0')
171            str++;
172        if (*str == ':')
173            str++;
174        count--;
175    }
176    errno = (*str ? ERANGE : 0);
177    return dst;
[1765]178}
179
[2725]180/* Return how long the file at fd is, if there's any way to determine it. */
181#ifdef UNUSED
182off_t FAST_FUNC fdlength(int fd)
[1765]183{
184    off_t bottom = 0, top = 0, pos;
185    long size;
186
187    // If the ioctl works for this, return it.
188
189    if (ioctl(fd, BLKGETSIZE, &size) >= 0) return size*512;
190
191    // FIXME: explain why lseek(SEEK_END) is not used here!
192
193    // If not, do a binary search for the last location we can read.  (Some
194    // block devices don't do BLKGETSIZE right.)
195
196    do {
197        char temp;
198
199        pos = bottom + (top - bottom) / 2;
200
201        // If we can read from the current location, it's bigger.
202
203        if (lseek(fd, pos, SEEK_SET)>=0 && safe_read(fd, &temp, 1)==1) {
204            if (bottom == top) bottom = top = (top+1) * 2;
205            else bottom = pos;
206
207        // If we can't, it's smaller.
208
209        } else {
210            if (bottom == top) {
211                if (!top) return 0;
212                bottom = top/2;
213            }
214            else top = pos;
215        }
216    } while (bottom + 1 != top);
217
218    return pos + 1;
219}
[821]220#endif
221
[2725]222int FAST_FUNC bb_putchar_stderr(char ch)
[821]223{
[2725]224    return write(STDERR_FILENO, &ch, 1);
[821]225}
226
[2725]227ssize_t FAST_FUNC full_write1_str(const char *str)
[821]228{
[2725]229    return full_write(STDOUT_FILENO, str, strlen(str));
[1765]230}
[821]231
[2725]232ssize_t FAST_FUNC full_write2_str(const char *str)
[1765]233{
[2725]234    return full_write(STDERR_FILENO, str, strlen(str));
[1765]235}
[821]236
[2725]237static int wh_helper(int value, int def_val, const char *env_name, int *err)
[1765]238{
[2725]239    if (value == 0) {
240        char *s = getenv(env_name);
241        if (s) {
242            value = atoi(s);
[3232]243            /* If LINES/COLUMNS are set, pretend that there is
[2725]244             * no error getting w/h, this prevents some ugly
245             * cursor tricks by our callers */
246            *err = 0;
247        }
[1765]248    }
[2725]249    if (value <= 1 || value >= 30000)
250        value = def_val;
251    return value;
[1765]252}
253
[2725]254/* It is perfectly ok to pass in a NULL for either width or for
255 * height, in which case that value will not be set.  */
256int FAST_FUNC get_terminal_width_height(int fd, unsigned *width, unsigned *height)
[821]257{
[2725]258    struct winsize win;
259    int err;
[1765]260
[2725]261    win.ws_row = 0;
262    win.ws_col = 0;
263    /* I've seen ioctl returning 0, but row/col is (still?) 0.
264     * We treat that as an error too.  */
265    err = ioctl(fd, TIOCGWINSZ, &win) != 0 || win.ws_row == 0;
266    if (height)
267        *height = wh_helper(win.ws_row, 24, "LINES", &err);
268    if (width)
269        *width = wh_helper(win.ws_col, 80, "COLUMNS", &err);
270    return err;
[1765]271}
272
[2725]273int FAST_FUNC tcsetattr_stdin_TCSANOW(const struct termios *tp)
[1765]274{
[2725]275    return tcsetattr(STDIN_FILENO, TCSANOW, tp);
[1765]276}
277
[2725]278pid_t FAST_FUNC safe_waitpid(pid_t pid, int *wstat, int options)
[1765]279{
[2725]280    pid_t r;
[1765]281
[2725]282    do
283        r = waitpid(pid, wstat, options);
284    while ((r == -1) && (errno == EINTR));
285    return r;
[1765]286}
[821]287
[2725]288pid_t FAST_FUNC wait_any_nohang(int *wstat)
[821]289{
[2725]290    return safe_waitpid(-1, wstat, WNOHANG);
[821]291}
292
[2725]293// Wait for the specified child PID to exit, returning child's error return.
294int FAST_FUNC wait4pid(pid_t pid)
[821]295{
[2725]296    int status;
[1765]297
[2725]298    if (pid <= 0) {
299        /*errno = ECHILD; -- wrong. */
300        /* we expect errno to be already set from failed [v]fork/exec */
301        return -1;
[1765]302    }
[2725]303    if (safe_waitpid(pid, &status, 0) == -1)
304        return -1;
305    if (WIFEXITED(status))
306        return WEXITSTATUS(status);
307    if (WIFSIGNALED(status))
308        return WTERMSIG(status) + 0x180;
309    return 0;
[821]310}
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