grep: add --threads=<num> option and grep.threads configuration

diff --git a/git-compat-util.h b/git-compat-util.h
index 9a3e5591cb4fd032ed9447ef09873b5da2f32266..88964f7886b1f6d7445b77a26eceb65d48c3b6b8 100644 (file)
--- a/git-compat-util.h
+++ b/git-compat-util.h
@@ -817,6 +817,9 @@ static inline int strtoul_ui(char const *s, int base, unsigned int *result)
        char *p;
 
        errno = 0;
+       /* negative values would be accepted by strtoul */
+       if (strchr(s, '-'))
+               return -1;
        ul = strtoul(s, &p, base);
        if (errno || *p || p == s || (unsigned int) ul != ul)
                return -1;