From 03ab5b9f78c26a833de7c594db5186f94e6f003d Mon Sep 17 00:00:00 2001
From: "K. Lange" <klange@toaruos.org>
Date: Fri, 29 Jun 2018 10:42:56 +0900
Subject: [PATCH] Fix missing execve; add .* printf support for s

---
 base/usr/include/unistd.h |  1 +
 libc/stdio/printf.c       | 15 ++++++++++-----
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/base/usr/include/unistd.h b/base/usr/include/unistd.h
index 9b297ebe..586e7314 100644
--- a/base/usr/include/unistd.h
+++ b/base/usr/include/unistd.h
@@ -18,6 +18,7 @@ extern int execle(const char *path, const char *arg, ...);
 extern int execv(const char *path, char *const argv[]);
 extern int execvp(const char *file, char *const argv[]);
 extern int execvpe(const char *file, char *const argv[], char *const envp[]);
+extern int execve(const char *name, char * const argv[], char * const envp[]);
 extern void _exit(int status);
 
 extern int setuid(uid_t uid);
diff --git a/libc/stdio/printf.c b/libc/stdio/printf.c
index d250958d..90fc35d0 100644
--- a/libc/stdio/printf.c
+++ b/libc/stdio/printf.c
@@ -100,7 +100,7 @@ size_t xvasprintf(char * buf, const char * fmt, va_list args) {
 	int i = 0;
 	char * s;
 	char * b = buf;
-	int precision = 0;
+	int precision = -1;
 	for (const char *f = fmt; *f; f++) {
 		if (*f != '%') {
 			*b++ = *f;
@@ -131,10 +131,15 @@ size_t xvasprintf(char * buf, const char * fmt, va_list args) {
 		if (*f == '.') {
 			++f;
 			precision = 0;
-			while (*f >= '0' && *f <= '9') {
-				precision *= 10;
-				precision += *f - '0';
+			if (*f == '*') {
+				precision = (int)va_arg(args, int);
 				++f;
+			} else  {
+				while (*f >= '0' && *f <= '9') {
+					precision *= 10;
+					precision += *f - '0';
+					++f;
+				}
 			}
 		}
 		if (*f == 'l') {
@@ -162,7 +167,7 @@ size_t xvasprintf(char * buf, const char * fmt, va_list args) {
 						if (s == NULL) {
 							s = "(null)";
 						}
-						if (precision > 0) {
+						if (precision >= 0) {
 							while (*s && precision > 0) {
 								*b++ = *s++;
 								count++;