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/*
* 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)
{
/* NB: on error, mktemp returns an empty string, not NULL */
if (mktemp(template)[0] == '\0' || 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
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