libc: bad, bsd-style mktemp (also add user app)

apps/mktemp.c

@@ -0,0 +1,72 @@
+/* vim: tabstop=4 shiftwidth=4 noexpandtab
+ * This file is part of ToaruOS and is released under the terms
+ * of the NCSA / University of Illinois License - see LICENSE.md
+ * Copyright (C) 2018 K. Lange
+ *
+ * mktemp - create a temporary directory and print its name
+ */
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <getopt.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/stat.h>
+
+int main(int argc, char * argv[]) {
+	int opt;
+	int dry_run = 0;
+	int quiet = 0;
+	int directory = 0;
+
+	while ((opt = getopt(argc,argv,"duq")) != -1) {
+		switch (opt) {
+			case 'd':
+				directory = 1;
+				break;
+			case 'u':
+				dry_run = 1;
+				break;
+			case 'q':
+				quiet = 1;
+				break;
+		}
+	}
+
+	char * template;
+	int i = optind;
+
+	if (i == argc) {
+		template = strdup("tmp.XXXXXX");
+	} else {
+		template = strdup(argv[i]);
+	}
+
+	char * result = mktemp(template);
+
+	if (!result) {
+		fprintf(stderr, "%s: %s\n", argv[0], strerror(errno));
+		return 1;
+	}
+
+	if (!quiet) {
+		fprintf(stdout, "%s\n", result);
+	}
+
+	if (!dry_run) {
+		if (directory) {
+			if (mkdir(result,0777) < 0) {
+				fprintf(stderr, "%s: mkdir: %s: %s\n", argv[0], result, strerror(errno));
+				return 1;
+			}
+		} else {
+			FILE * f = fopen(result,"w");
+			if (!f) {
+				fprintf(stderr, "%s: open: %s: %s\n", argv[0], result, strerror(errno));
+				return 1;
+			}
+		}
+	}
+
+	return 0;
+}

base/usr/include/stdlib.h

@@ -48,3 +48,5 @@ extern void abort(void);
 
 extern void *bsearch(const void *key, const void *base, size_t nmemb, size_t size,
 	int (*compar)(const void *, const void *));
+
+extern char * mktemp(char * template);

libc/stdlib/mktemp.c

@@ -0,0 +1,17 @@
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+char * mktemp(char * template) {
+	if (strstr(template + strlen(template)-6, "XXXXXX") != template + strlen(template) - 6) {
+		errno = EINVAL;
+		return NULL;
+	}
+	static int _i = 0;
+	char tmp[7] = {0};
+	sprintf(tmp,"%04d%02d", getpid(), _i++);
+	memcpy(template + strlen(template) - 6, tmp, 6);
+	return template;
+}