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       getenv.c - scc - simple c99 compiler
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       ---
       getenv.c (276B)
       ---
            1 #include <sys.h>
            2 
            3 #include <stdlib.h>
            4 #include <string.h>
            5 
            6 #undef getenv
            7 
            8 char *
            9 getenv(const char *name)
           10 {
           11         char **p, *s;
           12         size_t len = strlen(name);
           13 
           14         for (p = _environ; s = *p; ++p) {
           15                 if (!strncmp(name, s, len) && s[len] == '=')
           16                         return s + len + 1;
           17         }
           18         return NULL;
           19 }