From 4abab5ad6c8465a7528ccdd5f49367da05f78bbd Mon Sep 17 00:00:00 2001 From: Vladimir Azarov Date: Tue, 1 Oct 2024 15:47:05 +0200 Subject: Initial version --- src/env/putenv.c | 46 ++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 46 insertions(+) create mode 100644 src/env/putenv.c (limited to 'src/env/putenv.c') diff --git a/src/env/putenv.c b/src/env/putenv.c new file mode 100644 index 0000000..dce8c82 --- /dev/null +++ b/src/env/putenv.c @@ -0,0 +1,46 @@ +#include +#include +#include + +static void dummy(char *old, char *new) {} +weak_alias(dummy, __env_rm_add); + +int __putenv(char *s, size_t l, char *r) +{ + size_t i=0; + if (__environ) { + for (char **e = __environ; *e; e++, i++) + if (!strncmp(s, *e, l+1)) { + char *tmp = *e; + *e = s; + __env_rm_add(tmp, r); + return 0; + } + } + static char **oldenv; + char **newenv; + if (__environ == oldenv) { + newenv = realloc(oldenv, sizeof *newenv * (i+2)); + if (!newenv) goto oom; + } else { + newenv = malloc(sizeof *newenv * (i+2)); + if (!newenv) goto oom; + if (i) memcpy(newenv, __environ, sizeof *newenv * i); + free(oldenv); + } + newenv[i] = s; + newenv[i+1] = 0; + __environ = oldenv = newenv; + if (r) __env_rm_add(0, r); + return 0; +oom: + free(r); + return -1; +} + +int putenv(char *s) +{ + size_t l = __strchrnul(s, '=') - s; + if (!l || !s[l]) return unsetenv(s); + return __putenv(s, l, 0); +} -- cgit v1.2.3