implement "low hanging fruit" from C11

[musl] / src / stdio / fopen.c

diff --git a/src/stdio/fopen.c b/src/stdio/fopen.c
index 084cc73..0d5b1af 100644 (file)
--- a/src/stdio/fopen.c
+++ b/src/stdio/fopen.c
@@ -5,7 +5,6 @@ FILE *fopen(const char *filename, const char *mode)
        FILE *f;
        int fd;
        int flags;
-       int plus = !!strchr(mode, '+');
 
        /* Check for valid initial mode character */
        if (!strchr("rwa", *mode)) {
@@ -14,9 +13,10 @@ FILE *fopen(const char *filename, const char *mode)
        }
 
        /* Compute the flags to pass to open() */
-       if (plus) flags = O_RDWR;
+       if (strchr(mode, '+')) flags = O_RDWR;
        else if (*mode == 'r') flags = O_RDONLY;
        else flags = O_WRONLY;
+       if (strchr(mode, 'x')) flags |= O_EXCL;
        if (*mode != 'r') flags |= O_CREAT;
        if (*mode == 'w') flags |= O_TRUNC;
        if (*mode == 'a') flags |= O_APPEND;