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/* $Id: utils.c,v 1.16 2004/06/20 21:35:34 gerhard Exp $ */
/* Copyright Gerhard Rieger 2001-2004 */
/* Published under the GNU General Public License V.2, see file COPYING */
/* useful additions to C library */
#include "config.h"
#include "sysincludes.h"
#include "compat.h" /* socklen_t */
#include "mytypes.h"
#include "sycls.h"
#include "utils.h"
#if !HAVE_MEMRCHR
/* GNU extension, available since glibc 2.1.91 */
void *memrchr(const void *s, int c, size_t n) {
const unsigned char *t = ((unsigned char *)s)+n;
while (--t >= (unsigned char *)s) {
if (*t == c) break;
}
if (t < (unsigned char *)s)
return NULL;
return (void *)t;
}
#endif /* !HAVE_MEMRCHR */
void *memdup(const void *src, size_t n) {
void *dest;
if ((dest = Malloc(n)) == NULL) {
return NULL;
}
memcpy(dest, src, n);
return dest;
}
/* search the keyword-table for a match of the leading part of name. */
/* returns the pointer to the matching field of the keyword or NULL if no
keyword was found. */
const struct wordent *keyw(const struct wordent *keywds, const char *name, unsigned int nkeys) {
unsigned int lower, upper, mid;
int r;
lower = 0;
upper = nkeys;
while (upper - lower > 1)
{
mid = (upper + lower) >> 1;
if (!(r = strcasecmp(keywds[mid].name, name)))
{
return &keywds[mid];
}
if (r < 0)
lower = mid;
else
upper = mid;
}
if (nkeys > 0 && !(strcasecmp(keywds[lower].name, name)))
{
return &keywds[lower];
}
return NULL;
}
/* Linux: setenv(), AIX: putenv() */
#if !HAVE_SETENV
int setenv(const char *name, const char *value, int overwrite) {
int result;
char *env;
if (!overwrite) {
if (getenv(name)) return 0; /* already exists */
}
if ((env = Malloc(strlen(name)+strlen(value)+2)) != NULL) {
return -1;
}
sprintf(env, "%s=%s", name, value);
if ((result = putenv(env)) != 0) { /* AIX docu says "... nonzero ..." */
free(env);
result = -1;
}
/* linux "man putenv" says: ...this string becomes part of the environment*/
return result;
}
#endif /* !HAVE_SETENV */
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