source: MondoRescue/branches/3.3/mindi-busybox/libbb/platform.c@ 3621

/*
 * Replacements for common but usually nonstandard functions that aren't
 * supplied by all platforms.
 *
 * Copyright (C) 2009 by Dan Fandrich <dan@coneharvesters.com>, et. al.
 *
 * Licensed under GPLv2, see file LICENSE in this source tree.
 */
#include "libbb.h"

#ifndef HAVE_STRCHRNUL
char* FAST_FUNC strchrnul(const char *s, int c)
{
    while (*s != '\0' && *s != c)
        s++;
    return (char*)s;
}
#endif

#ifndef HAVE_USLEEP
int FAST_FUNC usleep(unsigned usec)
{
    struct timespec ts;
    ts.tv_sec = usec / 1000000u;
    ts.tv_nsec = (usec % 1000000u) * 1000u;
    /*
     * If a signal has non-default handler, nanosleep returns early.
     * Our version of usleep doesn't return early
     * if interrupted by such signals:
     *
     */
    while (nanosleep(&ts, &ts) != 0)
        continue;
    return 0;
}
#endif

#ifndef HAVE_VASPRINTF
int FAST_FUNC vasprintf(char **string_ptr, const char *format, va_list p)
{
    int r;
    va_list p2;
    char buf[128];

    va_copy(p2, p);
    r = vsnprintf(buf, 128, format, p);
    va_end(p);

    /* Note: can't use xstrdup/xmalloc, they call vasprintf (us) on failure! */

    if (r < 128) {
        va_end(p2);
        *string_ptr = strdup(buf);
        return (*string_ptr ? r : -1);
    }

    *string_ptr = malloc(r+1);
    r = (*string_ptr ? vsnprintf(*string_ptr, r+1, format, p2) : -1);
    va_end(p2);

    return r;
}
#endif

#ifndef HAVE_DPRINTF
/* dprintf is now part of POSIX.1, but was only added in 2008 */
int dprintf(int fd, const char *format, ...)
{
    va_list p;
    int r;
    char *string_ptr;

    va_start(p, format);
    r = vasprintf(&string_ptr, format, p);
    va_end(p);
    if (r >= 0) {
        r = full_write(fd, string_ptr, r);
        free(string_ptr);
    }
    return r;
}
#endif

#ifndef HAVE_MEMRCHR
/* Copyright (C) 2005 Free Software Foundation, Inc.
 * memrchr() is a GNU function that might not be available everywhere.
 * It's basically the inverse of memchr() - search backwards in a
 * memory block for a particular character.
 */
void* FAST_FUNC memrchr(const void *s, int c, size_t n)
{
    const char *start = s, *end = s;

    end += n - 1;

    while (end >= start) {
        if (*end == (char)c)
            return (void *) end;
        end--;
    }

    return NULL;
}
#endif

#ifndef HAVE_MKDTEMP
/* This is now actually part of POSIX.1, but was only added in 2008 */
char* FAST_FUNC mkdtemp(char *template)
{
    if (mktemp(template) == NULL || mkdir(template, 0700) != 0)
        return NULL;
    return template;
}
#endif

#ifndef HAVE_STRCASESTR
/* Copyright (c) 1999, 2000 The ht://Dig Group */
char* FAST_FUNC strcasestr(const char *s, const char *pattern)
{
    int length = strlen(pattern);

    while (*s) {
        if (strncasecmp(s, pattern, length) == 0)
            return (char *)s;
        s++;
    }
    return 0;
}
#endif

#ifndef HAVE_STRSEP
/* Copyright (C) 2004 Free Software Foundation, Inc. */
char* FAST_FUNC strsep(char **stringp, const char *delim)
{
    char *start = *stringp;
    char *ptr;

    if (!start)
        return NULL;

    if (!*delim)
        ptr = start + strlen(start);
    else {
        ptr = strpbrk(start, delim);
        if (!ptr) {
            *stringp = NULL;
            return start;
        }
    }

    *ptr = '\0';
    *stringp = ptr + 1;

    return start;
}
#endif

#ifndef HAVE_STPCPY
char* FAST_FUNC stpcpy(char *p, const char *to_add)
{
    while ((*p = *to_add) != '\0') {
        p++;
        to_add++;
    }
    return p;
}
#endif

#ifndef HAVE_GETLINE
ssize_t FAST_FUNC getline(char **lineptr, size_t *n, FILE *stream)
{
    int ch;
    char *line = *lineptr;
    size_t alloced = *n;
    size_t len = 0;

    do {
        ch = fgetc(stream);
        if (ch == EOF)
            break;
        if (len + 1 >= alloced) {
            alloced += alloced/4 + 64;
            line = xrealloc(line, alloced);
        }
        line[len++] = ch;
    } while (ch != '\n');

    if (len == 0)
        return -1;

    line[len] = '\0';
    *lineptr = line;
    *n = alloced;
    return len;
}
#endif

#ifndef HAVE_TTYNAME_R
int ttyname_r(int fd, char *buf, size_t buflen)
{
    int r;
    char path[sizeof("/proc/self/fd/%d") + sizeof(int)*3];

    if (!isatty(fd))
        return errno == EINVAL ? ENOTTY : errno;
    sprintf(path, "/proc/self/fd/%d", fd);
    r = readlink(path, buf, buflen);
    if (r < 0)
        return errno;
    if (r >= buflen)
        return ERANGE;
    buf[r] = '\0';
    return 0;
}
#endif