usr: libc: Add printf()

Signed-off-by: Ian Moffett <ian@osmora.org>

2 files changed, 17 insertions, 0 deletions

diff --git a/lib/libc/include/stdio.h b/lib/libc/include/stdio.h
index d94990b..88e66f6 100644
--- a/lib/libc/include/stdio.h
+++ b/lib/libc/include/stdio.h
@@ -77,6 +77,8 @@ size_t fwrite(const void *__restrict ptr, size_t size, size_t n, FILE *__restric
 
 int vsnprintf(char *s, size_t size, const char *fmt, va_list ap);
 int snprintf(char *s, size_t size, const char *fmt, ...);
+
+int printf(const char *__restrict fmt, ...);
 int fputc(int c, FILE *stream);
 
 int putchar(int c);
diff --git a/lib/libc/src/stdio/snprintf.c b/lib/libc/src/stdio/snprintf.c
index e343b77..2387950 100644
--- a/lib/libc/src/stdio/snprintf.c
+++ b/lib/libc/src/stdio/snprintf.c
@@ -30,6 +30,7 @@
 #include <sys/types.h>
 #include <stdio.h>
 #include <stddef.h>
+#include <unistd.h>
 
 /* TODO FIXME: Use stdarg.h */
 #define __va_start(ap, fmt)  __builtin_va_start(ap, fmt)
@@ -46,3 +47,17 @@ snprintf(char *s, size_t size, const char *fmt, ...)
     __va_end(ap);
     return ret;
 }
+
+int
+printf(const char *__restrict fmt, ...)
+{
+    char buf[512];
+    va_list ap;
+    int ret;
+
+    __va_start(ap, fmt);
+    ret = vsnprintf(buf, sizeof(buf), fmt, ap);
+    write(stdout->fd, buf, ret);
+    __va_end(ap);
+    return ret;
+}