compat/unsetenv.c

   1 #include "../git-compat-util.h"
   2
   3 int gitunsetenv(const char *name)
   4 {
   5 #if !defined(__MINGW32__)
   6      extern char **environ;
   7 #endif
   8      int src, dst;
   9      size_t nmln;
  10
  11      nmln = strlen(name);
  12
  13      for (src = dst = 0; environ[src]; ++src) {
  14           size_t enln;
  15           enln = strlen(environ[src]);
  16           if (enln > nmln) {
  17                /* might match, and can test for '=' safely */
  18                if (0 == strncmp (environ[src], name, nmln)
  19                    && '=' == environ[src][nmln])
  20                     /* matches, so skip */
  21                     continue;
  22           }
  23           environ[dst] = environ[src];
  24           ++dst;
  25      }
  26      environ[dst] = NULL;
  27
  28      return 0;
  29 }