Merge branch 'vn/xmmap-gently' into maint

diff --git a/strbuf.c b/strbuf.c
index 82e90f1dfe92d731d143f713f8ea02b79b01da9d..0e18b259ce51fc73f82f7b77032221b33411c25f 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -249,6 +249,42 @@ void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
        strbuf_splice(sb, pos, 0, data, len);
 }
 
+void strbuf_vinsertf(struct strbuf *sb, size_t pos, const char *fmt, va_list ap)
+{
+       int len, len2;
+       char save;
+       va_list cp;
+
+       if (pos > sb->len)
+               die("`pos' is too far after the end of the buffer");
+       va_copy(cp, ap);
+       len = vsnprintf(sb->buf + sb->len, 0, fmt, cp);
+       va_end(cp);
+       if (len < 0)
+               BUG("your vsnprintf is broken (returned %d)", len);
+       if (!len)
+               return; /* nothing to do */
+       if (unsigned_add_overflows(sb->len, len))
+               die("you want to use way too much memory");
+       strbuf_grow(sb, len);
+       memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
+       /* vsnprintf() will append a NUL, overwriting one of our characters */
+       save = sb->buf[pos + len];
+       len2 = vsnprintf(sb->buf + pos, len + 1, fmt, ap);
+       sb->buf[pos + len] = save;
+       if (len2 != len)
+               BUG("your vsnprintf is broken (returns inconsistent lengths)");
+       strbuf_setlen(sb, sb->len + len);
+}
+
+void strbuf_insertf(struct strbuf *sb, size_t pos, const char *fmt, ...)
+{
+       va_list ap;
+       va_start(ap, fmt);
+       strbuf_vinsertf(sb, pos, fmt, ap);
+       va_end(ap);
+}
+
 void strbuf_remove(struct strbuf *sb, size_t pos, size_t len)
 {
        strbuf_splice(sb, pos, len, "", 0);
@@ -395,6 +431,27 @@ void strbuf_expand(struct strbuf *sb, const char *format, expand_fn_t fn,
        }
 }
 
+size_t strbuf_expand_literal_cb(struct strbuf *sb,
+                               const char *placeholder,
+                               void *context)
+{
+       int ch;
+
+       switch (placeholder[0]) {
+       case 'n':               /* newline */
+               strbuf_addch(sb, '\n');
+               return 1;
+       case 'x':
+               /* %x00 == NUL, %x0a == LF, etc. */
+               ch = hex2chr(placeholder + 1);
+               if (ch < 0)
+                       return 0;
+               strbuf_addch(sb, ch);
+               return 3;
+       }
+       return 0;
+}
+
 size_t strbuf_expand_dict_cb(struct strbuf *sb, const char *placeholder,
                void *context)
 {