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authorMattias Andrée <maandree@member.fsf.org>2015-12-21 16:19:58 +0100
committerMattias Andrée <maandree@member.fsf.org>2015-12-21 16:19:58 +0100
commit35864dc694316712d137a06d8100ebdd2eb57f09 (patch)
tree7253edb37e59fc8d18364c4d302468392f890f3b /include
parentadd clearenv (diff)
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add getenv
Signed-off-by: Mattias Andrée <maandree@member.fsf.org>
Diffstat (limited to '')
-rw-r--r--include/stdlib.h26
1 files changed, 26 insertions, 0 deletions
diff --git a/include/stdlib.h b/include/stdlib.h
index ebfb5e2..0cb5f49 100644
--- a/include/stdlib.h
+++ b/include/stdlib.h
@@ -330,6 +330,32 @@ int clearenv(void)
__warning("It may be better to use `if (environ) *environ = NULL;`.");
#endif
+/**
+ * This function returns the value assoicated with a
+ * specified environment variable.
+ *
+ * Portable program must not check `errno`. No errors
+ * are defined by POSIX.
+ *
+ * @etymology (Get) the value of an (env)ironment variable!
+ *
+ * @param name The name of the sought environment variable.
+ * Must not be `NULL`.
+ * @return The value of the environment variable.
+ * `NULL` on error, or if not found. This
+ * pointer is subpointer, and must not be
+ * modified except for in-place changes.
+ *
+ * @throws 0 No such environment variable found.
+ * This is a slibc extensions.
+ * @throws EINVAL `name` is `NULL` (must not be the case), empty,
+ * or contains a '='. This is a slibc extensions.
+ *
+ * @since Always.
+ */
+char* getenv(const char*)
+ __GCC_ONLY(__attribute__((__warn_unused_result__, __nonnull__)));
+
/* TODO implement rand-functions */