Rework strbuf API and semantics.
The gory details are explained in strbuf.h. The change of semantics this
patch enforces is that the embeded buffer has always a '\0' character after
its last byte, to always make it a C-string. The offs-by-one changes are all
related to that very change.
A strbuf can be used to store byte arrays, or as an extended string
library. The `buf' member can be passed to any C legacy string function,
because strbuf operations always ensure there is a terminating \0 at the end
of the buffer, not accounted in the `len' field of the structure.
A strbuf can be used to generate a string/buffer whose final size is not
really known, and then "strbuf_detach" can be used to get the built buffer,
and keep the wrapping "strbuf" structure usable for further work again.
Other interesting feature: strbuf_grow(sb, size) ensure that there is
enough allocated space in `sb' to put `size' new octets of data in the
buffer. It helps avoiding reallocating data for nothing when the problem the
strbuf helps to solve has a known typical size.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
diff --git a/fast-import.c b/fast-import.c
index 078079d..2f7baf4 100644
--- a/fast-import.c
+++ b/fast-import.c
@@ -1595,7 +1595,7 @@
} else {
struct recent_command *rc;
- command_buf.buf = NULL;
+ strbuf_detach(&command_buf);
read_line(&command_buf, stdin, '\n');
if (command_buf.eof)
return;
@@ -1649,7 +1649,6 @@
size_t sz = 8192, term_len = command_buf.len - 5 - 2;
length = 0;
buffer = xmalloc(sz);
- command_buf.buf = NULL;
for (;;) {
read_line(&command_buf, stdin, '\n');
if (command_buf.eof)
@@ -1657,11 +1656,11 @@
if (term_len == command_buf.len
&& !strcmp(term, command_buf.buf))
break;
- ALLOC_GROW(buffer, length + command_buf.len, sz);
+ ALLOC_GROW(buffer, length + command_buf.len + 1, sz);
memcpy(buffer + length,
command_buf.buf,
- command_buf.len - 1);
- length += command_buf.len - 1;
+ command_buf.len);
+ length += command_buf.len;
buffer[length++] = '\n';
}
free(term);
@@ -2101,7 +2100,7 @@
}
/* file_change* */
- while (!command_buf.eof && command_buf.len > 1) {
+ while (!command_buf.eof && command_buf.len > 0) {
if (!prefixcmp(command_buf.buf, "M "))
file_change_m(b);
else if (!prefixcmp(command_buf.buf, "D "))
@@ -2256,7 +2255,7 @@
else
b = new_branch(sp);
read_next_command();
- if (!cmd_from(b) && command_buf.len > 1)
+ if (!cmd_from(b) && command_buf.len > 0)
unread_command_buf = 1;
}
@@ -2273,7 +2272,7 @@
static void cmd_progress(void)
{
- fwrite(command_buf.buf, 1, command_buf.len - 1, stdout);
+ fwrite(command_buf.buf, 1, command_buf.len, stdout);
fputc('\n', stdout);
fflush(stdout);
skip_optional_lf();
