New strbuf APIs: splice and attach.

* strbuf_splice replace a portion of the buffer with another.
* strbuf_attach replace a strbuf buffer with the given one, that should be
  malloc'ed. Then it enforces strbuf's invariants. If alloc > len, then this
  function has negligible cost, else it will perform a realloc, possibly
  with a cost.

Also some style issues are fixed now.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/strbuf.c b/strbuf.c
index d9190477e6dfdea558aa10771c2f643f7c2977d7..ff551ac9ff6f8122e698be1f72c763c99bd790e5 100644 (file)
--- a/strbuf.c
+++ b/strbuf.c
@@ -1,30 +1,45 @@
 #include "cache.h"
 #include "strbuf.h"
 
-void strbuf_init(struct strbuf *sb, size_t hint) {
+void strbuf_init(struct strbuf *sb, size_t hint)
+{
        memset(sb, 0, sizeof(*sb));
        if (hint)
                strbuf_grow(sb, hint);
 }
 
-void strbuf_release(struct strbuf *sb) {
+void strbuf_release(struct strbuf *sb)
+{
        free(sb->buf);
        memset(sb, 0, sizeof(*sb));
 }
 
-void strbuf_reset(struct strbuf *sb) {
+void strbuf_reset(struct strbuf *sb)
+{
        if (sb->len)
                strbuf_setlen(sb, 0);
        sb->eof = 0;
 }
 
-char *strbuf_detach(struct strbuf *sb) {
+char *strbuf_detach(struct strbuf *sb)
+{
        char *res = sb->buf;
        strbuf_init(sb, 0);
        return res;
 }
 
-void strbuf_grow(struct strbuf *sb, size_t extra) {
+void strbuf_attach(struct strbuf *sb, void *buf, size_t len, size_t alloc)
+{
+       strbuf_release(sb);
+       sb->buf   = buf;
+       sb->len   = len;
+       sb->alloc = alloc;
+       strbuf_grow(sb, 0);
+       sb->buf[sb->len] = '\0';
+}
+
+void strbuf_grow(struct strbuf *sb, size_t extra)
+{
        if (sb->len + extra + 1 <= sb->len)
                die("you want to use way too much memory");
        ALLOC_GROW(sb->buf, sb->len + extra + 1, sb->alloc);
@@ -37,24 +52,44 @@ void strbuf_rtrim(struct strbuf *sb)
        sb->buf[sb->len] = '\0';
 }
 
-void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len) {
+void strbuf_insert(struct strbuf *sb, size_t pos, const void *data, size_t len)
+{
        strbuf_grow(sb, len);
-       if (pos >= sb->len) {
-               pos = sb->len;
-       } else {
-               memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
-       }
+       if (pos > sb->len)
+               die("`pos' is too far after the end of the buffer");
+       memmove(sb->buf + pos + len, sb->buf + pos, sb->len - pos);
        memcpy(sb->buf + pos, data, len);
        strbuf_setlen(sb, sb->len + len);
 }
 
-void strbuf_add(struct strbuf *sb, const void *data, size_t len) {
+void strbuf_splice(struct strbuf *sb, size_t pos, size_t len,
+                                  const void *data, size_t dlen)
+{
+       if (pos + len < pos)
+               die("you want to use way too much memory");
+       if (pos > sb->len)
+               die("`pos' is too far after the end of the buffer");
+       if (pos + len > sb->len)
+               die("`pos + len' is too far after the end of the buffer");
+
+       if (dlen >= len)
+               strbuf_grow(sb, dlen - len);
+       memmove(sb->buf + pos + dlen,
+                       sb->buf + pos + len,
+                       sb->len - pos - len);
+       memcpy(sb->buf + pos, data, dlen);
+       strbuf_setlen(sb, sb->len + dlen - len);
+}
+
+void strbuf_add(struct strbuf *sb, const void *data, size_t len)
+{
        strbuf_grow(sb, len);
        memcpy(sb->buf + sb->len, data, len);
        strbuf_setlen(sb, sb->len + len);
 }
 
-void strbuf_addf(struct strbuf *sb, const char *fmt, ...) {
+void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+{
        int len;
        va_list ap;
 
@@ -76,7 +111,8 @@ void strbuf_addf(struct strbuf *sb, const char *fmt, ...) {
        strbuf_setlen(sb, sb->len + len);
 }
 
-size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f) {
+size_t strbuf_fread(struct strbuf *sb, size_t size, FILE *f)
+{
        size_t res;
 
        strbuf_grow(sb, size);
@@ -110,7 +146,8 @@ ssize_t strbuf_read(struct strbuf *sb, int fd, size_t hint)
        return sb->len - oldlen;
 }
 
-void read_line(struct strbuf *sb, FILE *fp, int term) {
+void read_line(struct strbuf *sb, FILE *fp, int term)
+{
        int ch;
        if (feof(fp)) {
                strbuf_release(sb);

diff --git a/strbuf.h b/strbuf.h
index 21fc111f9d489560348193ad99aa2ac52d9ea7e1..f163c63e6f405464c343e54f35bab53f53ea6980 100644 (file)
--- a/strbuf.h
+++ b/strbuf.h
@@ -55,6 +55,7 @@ extern void strbuf_init(struct strbuf *, size_t);
 extern void strbuf_release(struct strbuf *);
 extern void strbuf_reset(struct strbuf *);
 extern char *strbuf_detach(struct strbuf *);
+extern void strbuf_attach(struct strbuf *, void *, size_t, size_t);
 
 /*----- strbuf size related -----*/
 static inline size_t strbuf_avail(struct strbuf *sb) {
@@ -81,6 +82,10 @@ static inline void strbuf_addch(struct strbuf *sb, int c) {
 /* inserts after pos, or appends if pos >= sb->len */
 extern void strbuf_insert(struct strbuf *, size_t pos, const void *, size_t);
 
+/* splice pos..pos+len with given data */
+extern void strbuf_splice(struct strbuf *, size_t pos, size_t len,
+                                                 const void *, size_t);
+
 extern void strbuf_add(struct strbuf *, const void *, size_t);
 static inline void strbuf_addstr(struct strbuf *sb, const char *s) {
        strbuf_add(sb, s, strlen(s));