Document git blame --reverse.

[git.git] / strbuf.c

diff --git a/strbuf.c b/strbuf.c
index 13be67e4d3e38472adbff019a34e3f5ce9621dd7..bdf49544d47b97475800b104ed9efe8f846db265 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -288,6 +288,33 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
        return sb->len - oldlen;
 }
 
+#define STRBUF_MAXLINK (2*PATH_MAX)
+
+int strbuf_readlink(struct strbuf *sb, const char *path, size_t hint)
+{
+       if (hint < 32)
+               hint = 32;
+
+       while (hint < STRBUF_MAXLINK) {
+               int len;
+
+               strbuf_grow(sb, hint);
+               len = readlink(path, sb->buf, hint);
+               if (len < 0) {
+                       if (errno != ERANGE)
+                               break;
+               } else if (len < hint) {
+                       strbuf_setlen(sb, len);
+                       return 0;
+               }
+
+               /* .. the buffer was too small - try again */
+               hint *= 2;
+       }
+       strbuf_release(sb);
+       return -1;
+}
+
 int strbuf_getline(struct strbuf *sb, FILE *fp, int term)
 {
        int ch;