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New strbuf APIs: splice and attach.

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* 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>
This commit is contained in:
Pierre Habouzit 2007-09-15 15:56:50 +02:00 committed by Junio C Hamano
parent 760da9607e
commit 917c9a7133
2 changed files with 57 additions and 15 deletions
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67
strbuf.c
View File

@ -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);

5
strbuf.h
View File

@ -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));