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/*
* Copyright (C) 2009-2011 the libgit2 contributors
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "buffer.h"
#include "posix.h"
#include <stdarg.h>
#define ENSURE_SIZE(b, d) \
if ((ssize_t)(d) > buf->asize && git_buf_grow(b, (d)) < GIT_SUCCESS)\
return;
int git_buf_grow(git_buf *buf, size_t target_size)
{
char *new_ptr;
if (buf->asize < 0)
return GIT_ENOMEM;
if (target_size <= (size_t)buf->asize)
return GIT_SUCCESS;
if (buf->asize == 0)
buf->asize = target_size;
/* grow the buffer size by 1.5, until it's big enough
* to fit our target size */
while (buf->asize < (int)target_size)
buf->asize = (buf->asize << 1) - (buf->asize >> 1);
/* round allocation up to multiple of 8 */
buf->asize = (buf->asize + 7) & ~7;
new_ptr = git__realloc(buf->ptr, buf->asize);
if (!new_ptr) {
buf->asize = -1;
return GIT_ENOMEM;
}
buf->ptr = new_ptr;
return GIT_SUCCESS;
}
int git_buf_oom(const git_buf *buf)
{
return (buf->asize < 0);
}
void git_buf_set(git_buf *buf, const char *data, size_t len)
{
if (len == 0 || data == NULL) {
git_buf_clear(buf);
} else {
ENSURE_SIZE(buf, len);
memmove(buf->ptr, data, len);
buf->size = len;
}
}
void git_buf_sets(git_buf *buf, const char *string)
{
git_buf_set(buf, string, string ? strlen(string) : 0);
}
void git_buf_putc(git_buf *buf, char c)
{
ENSURE_SIZE(buf, buf->size + 1);
buf->ptr[buf->size++] = c;
}
void git_buf_put(git_buf *buf, const char *data, size_t len)
{
ENSURE_SIZE(buf, buf->size + len);
memmove(buf->ptr + buf->size, data, len);
buf->size += len;
}
void git_buf_puts(git_buf *buf, const char *string)
{
if (string != NULL)
git_buf_put(buf, string, strlen(string));
}
void git_buf_printf(git_buf *buf, const char *format, ...)
{
int len;
va_list arglist;
ENSURE_SIZE(buf, buf->size + 1);
while (1) {
va_start(arglist, format);
len = p_vsnprintf(buf->ptr + buf->size, buf->asize - buf->size, format, arglist);
va_end(arglist);
if (len < 0) {
buf->asize = -1;
return;
}
if (len + 1 <= buf->asize - buf->size) {
buf->size += len;
return;
}
ENSURE_SIZE(buf, buf->size + len + 1);
}
}
const char *git_buf_cstr(git_buf *buf)
{
if (buf->size + 1 > buf->asize &&
git_buf_grow(buf, buf->size + 1) < GIT_SUCCESS)
return NULL;
buf->ptr[buf->size] = '\0';
return buf->ptr;
}
void git_buf_free(git_buf *buf)
{
if (buf) {
if (buf->ptr) {
git__free(buf->ptr);
buf->ptr = NULL;
}
buf->asize = 0;
buf->size = 0;
}
}
void git_buf_clear(git_buf *buf)
{
buf->size = 0;
}
void git_buf_consume(git_buf *buf, const char *end)
{
if (end > buf->ptr && end <= buf->ptr + buf->size) {
size_t consumed = end - buf->ptr;
memmove(buf->ptr, end, buf->size - consumed);
buf->size -= consumed;
}
}
void git_buf_swap(git_buf *buf_a, git_buf *buf_b)
{
git_buf t = *buf_a;
*buf_a = *buf_b;
*buf_b = t;
}
char *git_buf_take_cstr(git_buf *buf)
{
char *data = NULL;
if (buf->ptr == NULL)
return NULL;
if (buf->size + 1 > buf->asize &&
git_buf_grow(buf, buf->size + 1) < GIT_SUCCESS)
return NULL;
data = buf->ptr;
data[buf->size] = '\0';
buf->ptr = NULL;
buf->asize = 0;
buf->size = 0;
return data;
}
void git_buf_join(git_buf *buf, char separator, int nbuf, ...)
{
/* Make two passes to avoid multiple reallocation */
va_list ap;
int i;
int total_size = 0;
char *out;
if (buf->size > 0 && buf->ptr[buf->size - 1] != separator)
++total_size; /* space for initial separator */
va_start(ap, nbuf);
for (i = 0; i < nbuf; ++i) {
const char* segment;
int segment_len;
segment = va_arg(ap, const char *);
if (!segment)
continue;
segment_len = strlen(segment);
total_size += segment_len;
if (segment_len == 0 || segment[segment_len - 1] != separator)
++total_size; /* space for separator */
}
va_end(ap);
ENSURE_SIZE(buf, buf->size + total_size);
out = buf->ptr + buf->size;
/* append separator to existing buf if needed */
if (buf->size > 0 && out[-1] != separator)
*out++ = separator;
va_start(ap, nbuf);
for (i = 0; i < nbuf; ++i) {
const char* segment;
int segment_len;
segment = va_arg(ap, const char *);
if (!segment)
continue;
/* skip leading separators */
if (out > buf->ptr && out[-1] == separator)
while (*segment == separator) segment++;
/* copy over next buffer */
segment_len = strlen(segment);
if (segment_len > 0) {
memmove(out, segment, segment_len);
out += segment_len;
}
/* append trailing separator (except for last item) */
if (i < nbuf - 1 && out > buf->ptr && out[-1] != separator)
*out++ = separator;
}
va_end(ap);
/* set size based on num characters actually written */
buf->size = out - buf->ptr;
}
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