git/compat/unsetenv.c

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