initial check-in, version 0.5.0

src/stdio/tmpnam.c

@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <limits.h>
+#include <unistd.h>
+#include "libc.h"
+
+char *tmpnam(char *s)
+{
+	static int lock;
+	static int index;
+	static char *s2;
+	int pid = getpid();
+	char *dir = getenv("TMPDIR");
+
+	if (!s) {
+		if (!s2) s2 = malloc(L_tmpnam);
+		s = s2;
+	}
+
+	/* this interface is insecure anyway but at least we can try.. */
+	if (!dir || strlen(dir) > L_tmpnam-32)
+		dir = P_tmpdir;
+
+	if (access(dir, R_OK|W_OK|X_OK) != 0)
+		return NULL;
+
+	LOCK(&lock);
+	for (index++; index < TMP_MAX; index++) {
+		snprintf(s, L_tmpnam, "%s/temp%d-%d", dir, pid, index);
+		if (access(s, F_OK) != 0) {
+			UNLOCK(&lock);
+			return s;
+		}
+	}
+	UNLOCK(&lock);
+	return NULL;
+}