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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* 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 "git2/buffer.h"
#include <stdarg.h>
#include <ctype.h>
/* Used as default value for git_buf->ptr so that people can always
* assume ptr is non-NULL and zero terminated even for new git_bufs.
*/
char git_buf__initbuf[1];
char git_buf__oom[1];
#define ENSURE_SIZE(b, d) \
if ((d) > buf->asize && git_buf_grow(b, (d)) < 0)\
return -1;
void git_buf_init(git_buf *buf, size_t initial_size)
{
buf->asize = 0;
buf->size = 0;
buf->ptr = git_buf__initbuf;
if (initial_size)
git_buf_grow(buf, initial_size);
}
int git_buf_try_grow(
git_buf *buf, size_t target_size, bool mark_oom, bool preserve_external)
{
char *new_ptr;
size_t new_size;
if (buf->ptr == git_buf__oom)
return -1;
if (!target_size)
target_size = buf->size;
if (target_size <= buf->asize)
return 0;
if (buf->asize == 0) {
new_size = target_size;
new_ptr = NULL;
} else {
new_size = buf->asize;
new_ptr = buf->ptr;
}
/* grow the buffer size by 1.5, until it's big enough
* to fit our target size */
while (new_size < target_size)
new_size = (new_size << 1) - (new_size >> 1);
/* round allocation up to multiple of 8 */
new_size = (new_size + 7) & ~7;
new_ptr = git__realloc(new_ptr, new_size);
if (!new_ptr) {
if (mark_oom)
buf->ptr = git_buf__oom;
return -1;
}
if (preserve_external && !buf->asize && buf->ptr != NULL && buf->size > 0)
memcpy(new_ptr, buf->ptr, min(buf->size, new_size));
buf->asize = new_size;
buf->ptr = new_ptr;
/* truncate the existing buffer size if necessary */
if (buf->size >= buf->asize)
buf->size = buf->asize - 1;
buf->ptr[buf->size] = '\0';
return 0;
}
int git_buf_grow(git_buf *buffer, size_t target_size)
{
return git_buf_try_grow(buffer, target_size, true, true);
}
void git_buf_free(git_buf *buf)
{
if (!buf) return;
if (buf->asize > 0 && buf->ptr != NULL && buf->ptr != git_buf__oom)
git__free(buf->ptr);
git_buf_init(buf, 0);
}
void git_buf_clear(git_buf *buf)
{
buf->size = 0;
if (!buf->ptr)
buf->ptr = git_buf__initbuf;
if (buf->asize > 0)
buf->ptr[0] = '\0';
}
int git_buf_set(git_buf *buf, const void *data, size_t len)
{
if (len == 0 || data == NULL) {
git_buf_clear(buf);
} else {
if (data != buf->ptr) {
ENSURE_SIZE(buf, len + 1);
memmove(buf->ptr, data, len);
}
buf->size = len;
buf->ptr[buf->size] = '\0';
}
return 0;
}
int git_buf_sets(git_buf *buf, const char *string)
{
return git_buf_set(buf, string, string ? strlen(string) : 0);
}
int git_buf_putc(git_buf *buf, char c)
{
ENSURE_SIZE(buf, buf->size + 2);
buf->ptr[buf->size++] = c;
buf->ptr[buf->size] = '\0';
return 0;
}
int git_buf_put(git_buf *buf, const char *data, size_t len)
{
ENSURE_SIZE(buf, buf->size + len + 1);
memmove(buf->ptr + buf->size, data, len);
buf->size += len;
buf->ptr[buf->size] = '\0';
return 0;
}
int git_buf_puts(git_buf *buf, const char *string)
{
assert(string);
return git_buf_put(buf, string, strlen(string));
}
static const char b64str[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
int git_buf_put_base64(git_buf *buf, const char *data, size_t len)
{
size_t extra = len % 3;
uint8_t *write, a, b, c;
const uint8_t *read = (const uint8_t *)data;
ENSURE_SIZE(buf, buf->size + 4 * ((len / 3) + !!extra) + 1);
write = (uint8_t *)&buf->ptr[buf->size];
/* convert each run of 3 bytes into 4 output bytes */
for (len -= extra; len > 0; len -= 3) {
a = *read++;
b = *read++;
c = *read++;
*write++ = b64str[a >> 2];
*write++ = b64str[(a & 0x03) << 4 | b >> 4];
*write++ = b64str[(b & 0x0f) << 2 | c >> 6];
*write++ = b64str[c & 0x3f];
}
if (extra > 0) {
a = *read++;
b = (extra > 1) ? *read++ : 0;
*write++ = b64str[a >> 2];
*write++ = b64str[(a & 0x03) << 4 | b >> 4];
*write++ = (extra > 1) ? b64str[(b & 0x0f) << 2] : '=';
*write++ = '=';
}
buf->size = ((char *)write) - buf->ptr;
buf->ptr[buf->size] = '\0';
return 0;
}
int git_buf_vprintf(git_buf *buf, const char *format, va_list ap)
{
int len;
const size_t expected_size = buf->size + (strlen(format) * 2);
ENSURE_SIZE(buf, expected_size);
while (1) {
va_list args;
va_copy(args, ap);
len = p_vsnprintf(
buf->ptr + buf->size,
buf->asize - buf->size,
format, args
);
if (len < 0) {
git__free(buf->ptr);
buf->ptr = git_buf__oom;
return -1;
}
if ((size_t)len + 1 <= buf->asize - buf->size) {
buf->size += len;
break;
}
ENSURE_SIZE(buf, buf->size + len + 1);
}
return 0;
}
int git_buf_printf(git_buf *buf, const char *format, ...)
{
int r;
va_list ap;
va_start(ap, format);
r = git_buf_vprintf(buf, format, ap);
va_end(ap);
return r;
}
void git_buf_copy_cstr(char *data, size_t datasize, const git_buf *buf)
{
size_t copylen;
assert(data && datasize && buf);
data[0] = '\0';
if (buf->size == 0 || buf->asize <= 0)
return;
copylen = buf->size;
if (copylen > datasize - 1)
copylen = datasize - 1;
memmove(data, buf->ptr, copylen);
data[copylen] = '\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;
buf->ptr[buf->size] = '\0';
}
}
void git_buf_truncate(git_buf *buf, size_t len)
{
if (len < buf->size) {
buf->size = len;
buf->ptr[buf->size] = '\0';
}
}
void git_buf_shorten(git_buf *buf, size_t amount)
{
if (amount > buf->size)
amount = buf->size;
buf->size = buf->size - amount;
buf->ptr[buf->size] = '\0';
}
void git_buf_rtruncate_at_char(git_buf *buf, char separator)
{
ssize_t idx = git_buf_rfind_next(buf, separator);
git_buf_truncate(buf, idx < 0 ? 0 : (size_t)idx);
}
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_detach(git_buf *buf)
{
char *data = buf->ptr;
if (buf->asize == 0 || buf->ptr == git_buf__oom)
return NULL;
git_buf_init(buf, 0);
return data;
}
void git_buf_attach(git_buf *buf, char *ptr, size_t asize)
{
git_buf_free(buf);
if (ptr) {
buf->ptr = ptr;
buf->size = strlen(ptr);
if (asize)
buf->asize = (asize < buf->size) ? buf->size + 1 : asize;
else /* pass 0 to fall back on strlen + 1 */
buf->asize = buf->size + 1;
} else {
git_buf_grow(buf, asize);
}
}
int git_buf_join_n(git_buf *buf, char separator, int nbuf, ...)
{
va_list ap;
int i;
size_t total_size = 0, original_size = buf->size;
char *out, *original = buf->ptr;
if (buf->size > 0 && buf->ptr[buf->size - 1] != separator)
++total_size; /* space for initial separator */
/* Make two passes to avoid multiple reallocation */
va_start(ap, nbuf);
for (i = 0; i < nbuf; ++i) {
const char* segment;
size_t 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);
/* expand buffer if needed */
if (total_size == 0)
return 0;
if (git_buf_grow(buf, buf->size + total_size + 1) < 0)
return -1;
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;
size_t segment_len;
segment = va_arg(ap, const char *);
if (!segment)
continue;
/* deal with join that references buffer's original content */
if (segment >= original && segment < original + original_size) {
size_t offset = (segment - original);
segment = buf->ptr + offset;
segment_len = original_size - offset;
} else {
segment_len = strlen(segment);
}
/* skip leading separators */
if (out > buf->ptr && out[-1] == separator)
while (segment_len > 0 && *segment == separator) {
segment++;
segment_len--;
}
/* copy over next buffer */
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;
buf->ptr[buf->size] = '\0';
return 0;
}
int git_buf_join(
git_buf *buf,
char separator,
const char *str_a,
const char *str_b)
{
size_t strlen_a = str_a ? strlen(str_a) : 0;
size_t strlen_b = strlen(str_b);
int need_sep = 0;
ssize_t offset_a = -1;
/* not safe to have str_b point internally to the buffer */
assert(str_b < buf->ptr || str_b > buf->ptr + buf->size);
/* figure out if we need to insert a separator */
if (separator && strlen_a) {
while (*str_b == separator) { str_b++; strlen_b--; }
if (str_a[strlen_a - 1] != separator)
need_sep = 1;
}
/* str_a could be part of the buffer */
if (str_a >= buf->ptr && str_a < buf->ptr + buf->size)
offset_a = str_a - buf->ptr;
if (git_buf_grow(buf, strlen_a + strlen_b + need_sep + 1) < 0)
return -1;
/* fix up internal pointers */
if (offset_a >= 0)
str_a = buf->ptr + offset_a;
/* do the actual copying */
if (offset_a != 0)
memmove(buf->ptr, str_a, strlen_a);
if (need_sep)
buf->ptr[strlen_a] = separator;
memcpy(buf->ptr + strlen_a + need_sep, str_b, strlen_b);
buf->size = strlen_a + strlen_b + need_sep;
buf->ptr[buf->size] = '\0';
return 0;
}
void git_buf_rtrim(git_buf *buf)
{
while (buf->size > 0) {
if (!git__isspace(buf->ptr[buf->size - 1]))
break;
buf->size--;
}
buf->ptr[buf->size] = '\0';
}
int git_buf_cmp(const git_buf *a, const git_buf *b)
{
int result = memcmp(a->ptr, b->ptr, min(a->size, b->size));
return (result != 0) ? result :
(a->size < b->size) ? -1 : (a->size > b->size) ? 1 : 0;
}
int git_buf_splice(
git_buf *buf,
size_t where,
size_t nb_to_remove,
const char *data,
size_t nb_to_insert)
{
assert(buf &&
where <= git_buf_len(buf) &&
where + nb_to_remove <= git_buf_len(buf));
/* Ported from git.git
* https://github.com/git/git/blob/16eed7c/strbuf.c#L159-176
*/
if (git_buf_grow(buf, git_buf_len(buf) + nb_to_insert - nb_to_remove) < 0)
return -1;
memmove(buf->ptr + where + nb_to_insert,
buf->ptr + where + nb_to_remove,
buf->size - where - nb_to_remove);
memcpy(buf->ptr + where, data, nb_to_insert);
buf->size = buf->size + nb_to_insert - nb_to_remove;
buf->ptr[buf->size] = '\0';
return 0;
}
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