compat/setenv.c

   1 #include "../git-compat-util.h"
   2
   3 int gitsetenv(const char *name, const char *value, int replace)
   4 {
   5         int out;
   6         size_t namelen, valuelen;
   7         char *envstr;
   8
   9         if (!name || strchr(name, '=') || !value) {
  10                 errno = EINVAL;
  11                 return -1;
  12         }
  13         if (!replace) {
  14                 char *oldval = NULL;
  15                 oldval = getenv(name);
  16                 if (oldval) return 0;
  17         }
  18
  19         namelen = strlen(name);
  20         valuelen = strlen(value);
  21         envstr = malloc(st_add3(namelen, valuelen, 2));
  22         if (!envstr) {
  23                 errno = ENOMEM;
  24                 return -1;
  25         }
  26
  27         memcpy(envstr, name, namelen);
  28         envstr[namelen] = '=';
  29         memcpy(envstr + namelen + 1, value, valuelen);
  30         envstr[namelen + valuelen + 1] = 0;
  31
  32         out = putenv(envstr);
  33         /* putenv(3) makes the argument string part of the environment,
  34          * and changing that string modifies the environment --- which
  35          * means we do not own that storage anymore.  Do not free
  36          * envstr.
  37          */
  38
  39         return out;
  40 }