compat/unsetenv.c

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