root/compat/setenv.c

DEFINITIONS

1. gitsetenv

#include "../git-compat-util.h"

int gitsetenv(const char *name, const char *value, int replace)
{
        int out;
        size_t namelen, valuelen;
        char *envstr;

        if (!name || strchr(name, '=') || !value) {
                errno = EINVAL;
                return -1;
        }
        if (!replace) {
                char *oldval = NULL;
                oldval = getenv(name);
                if (oldval) return 0;
        }

        namelen = strlen(name);
        valuelen = strlen(value);
        envstr = malloc((namelen + valuelen + 2));
        if (!envstr) {
                errno = ENOMEM;
                return -1;
        }

        memcpy(envstr, name, namelen);
        envstr[namelen] = '=';
        memcpy(envstr + namelen + 1, value, valuelen);
        envstr[namelen + valuelen + 1] = 0;

        out = putenv(envstr);
        /* putenv(3) makes the argument string part of the environment,
         * and changing that string modifies the environment --- which
         * means we do not own that storage anymore.  Do not free
         * envstr.
         */

        return out;
}