compat/setenv.c

   1 #include <stdlib.h>
   2 #include <string.h>
   3
   4 int gitsetenv(const char *name, const char *value, int replace)
   5 {
   6         int out;
   7         size_t namelen, valuelen;
   8         char *envstr;
   9
  10         if (!name || !value) return -1;
  11         if (!replace) {
  12                 char *oldval = NULL;
  13                 oldval = getenv(name);
  14                 if (oldval) return 0;
  15         }
  16
  17         namelen = strlen(name);
  18         valuelen = strlen(value);
  19         envstr = malloc((namelen + valuelen + 2));
  20         if (!envstr) return -1;
  21
  22         memcpy(envstr, name, namelen);
  23         envstr[namelen] = '=';
  24         memcpy(envstr + namelen + 1, value, valuelen);
  25         envstr[namelen + valuelen + 1] = 0;
  26
  27         out = putenv(envstr);
  28         /* putenv(3) makes the argument string part of the environment,
  29          * and changing that string modifies the environment --- which
  30          * means we do not own that storage anymore.  Do not free
  31          * envstr.
  32          */
  33
  34         return out;
  35 }