klibc/putenv.c

/*
 * putenv.c
 */

#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

/* str should be a duplicated version of the input string;
   len is the length of the key including the = sign */
int __put_env(char *str, size_t len, int overwrite);

int putenv(const char *str)
{
  char *s;
  const char *e, *z;

  if ( !str ) {
    errno = EINVAL;
    return -1;
  }

  e = NULL;
  for ( z = str ; *z ; z++ ) {
    if ( *z == '=' )
      e = z;
  }

  if ( !e ) {
    errno = EINVAL;
    return -1;
  }

  s = strdup(str);
  if ( !s )
    return -1;

  return __put_env(s, e-str, 1);
}