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Merge pull request #503 from arrbee/git-buf-always-cstr

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Make git_buf functions always maintain a valid cstr
This commit is contained in:
Vicent Martí 2011-11-30 11:02:34 -08:00
commit f5f0482658
3 changed files with 113 additions and 51 deletions
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118
src/buffer.c
View File

@ -8,13 +8,29 @@
#include "posix.h"
#include <stdarg.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];
#define ENSURE_SIZE(b, d) \
if ((ssize_t)(d) > buf->asize && git_buf_grow(b, (d)) < GIT_SUCCESS)\
return;
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_grow(git_buf *buf, size_t target_size)
{
char *new_ptr;
size_t new_size;
if (buf->asize < 0)
return GIT_ENOMEM;
@ -22,27 +38,56 @@ int git_buf_grow(git_buf *buf, size_t target_size)
if (target_size <= (size_t)buf->asize)
return GIT_SUCCESS;
if (buf->asize == 0)
buf->asize = target_size;
if (buf->asize == 0) {
new_size = target_size;
new_ptr = NULL;
} else {
new_size = (size_t)buf->asize;
new_ptr = buf->ptr;
}
/* 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);
while (new_size < target_size)
new_size = (new_size << 1) - (new_size >> 1);
/* round allocation up to multiple of 8 */
buf->asize = (buf->asize + 7) & ~7;
new_size = (new_size + 7) & ~7;
new_ptr = git__realloc(buf->ptr, buf->asize);
new_ptr = git__realloc(new_ptr, new_size);
if (!new_ptr) {
buf->asize = -1;
return GIT_ENOMEM;
}
buf->ptr = new_ptr;
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 GIT_SUCCESS;
}
void git_buf_free(git_buf *buf)
{
if (!buf) return;
if (buf->ptr != git_buf_initbuf)
git__free(buf->ptr);
git_buf_init(buf, 0);
}
void git_buf_clear(git_buf *buf)
{
buf->size = 0;
if (buf->asize > 0)
buf->ptr[0] = '\0';
}
int git_buf_oom(const git_buf *buf)
{
return (buf->asize < 0);
@ -53,9 +98,10 @@ 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);
ENSURE_SIZE(buf, len + 1);
memmove(buf->ptr, data, len);
buf->size = len;
buf->ptr[buf->size] = '\0';
}
}
@ -66,15 +112,17 @@ void git_buf_sets(git_buf *buf, const char *string)
void git_buf_putc(git_buf *buf, char c)
{
ENSURE_SIZE(buf, buf->size + 1);
ENSURE_SIZE(buf, buf->size + 2);
buf->ptr[buf->size++] = c;
buf->ptr[buf->size] = '\0';
}
void git_buf_put(git_buf *buf, const char *data, size_t len)
{
ENSURE_SIZE(buf, buf->size + len);
ENSURE_SIZE(buf, buf->size + len + 1);
memmove(buf->ptr + buf->size, data, len);
buf->size += len;
buf->ptr[buf->size] = '\0';
}
void git_buf_puts(git_buf *buf, const char *string)
@ -111,27 +159,25 @@ void git_buf_printf(git_buf *buf, const char *format, ...)
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)
void git_buf_copy_cstr(char *data, size_t datasize, git_buf *buf)
{
if (!buf) return;
size_t copylen;
git__free(buf->ptr);
buf->ptr = NULL;
buf->asize = 0;
buf->size = 0;
}
assert(data && datasize);
void git_buf_clear(git_buf *buf)
{
buf->size = 0;
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)
@ -140,6 +186,7 @@ void git_buf_consume(git_buf *buf, const char *end)
size_t consumed = end - buf->ptr;
memmove(buf->ptr, end, buf->size - consumed);
buf->size -= consumed;
buf->ptr[buf->size] = '\0';
}
}
@ -152,21 +199,12 @@ void git_buf_swap(git_buf *buf_a, git_buf *buf_b)
char *git_buf_take_cstr(git_buf *buf)
{
char *data = NULL;
char *data = buf->ptr;
if (buf->ptr == NULL)
if (buf->asize <= 0)
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;
git_buf_init(buf, 0);
return data;
}
@ -199,7 +237,7 @@ void git_buf_join_n(git_buf *buf, char separator, int nbuf, ...)
}
va_end(ap);
ENSURE_SIZE(buf, buf->size + total_size);
ENSURE_SIZE(buf, buf->size + total_size + 1);
out = buf->ptr + buf->size;
@ -235,6 +273,7 @@ void git_buf_join_n(git_buf *buf, char separator, int nbuf, ...)
/* set size based on num characters actually written */
buf->size = out - buf->ptr;
buf->ptr[buf->size] = '\0';
}
void git_buf_join(
@ -277,7 +316,7 @@ void git_buf_join(
if (!add_size) return;
ENSURE_SIZE(buf, buf->size + add_size);
ENSURE_SIZE(buf, buf->size + add_size + 1);
/* concatenate strings */
ptr = buf->ptr + buf->size;
@ -296,4 +335,5 @@ void git_buf_join(
/* set size based on num characters actually written */
buf->size = ptr - buf->ptr;
buf->ptr[buf->size] = '\0';
}

6
src/buffer.h
View File

@ -14,8 +14,11 @@ typedef struct {
ssize_t asize, size;
} git_buf;
#define GIT_BUF_INIT {NULL, 0, 0}
extern char git_buf_initbuf[];
#define GIT_BUF_INIT { git_buf_initbuf, 0, 0 }
void git_buf_init(git_buf *buf, size_t initial_size);
int git_buf_grow(git_buf *buf, size_t target_size);
void git_buf_free(git_buf *buf);
void git_buf_swap(git_buf *buf_a, git_buf *buf_b);
@ -42,6 +45,7 @@ void git_buf_join(git_buf *buf, char separator, const char *str_a, const char *s
const char *git_buf_cstr(git_buf *buf);
char *git_buf_take_cstr(git_buf *buf);
void git_buf_copy_cstr(char *data, size_t datasize, git_buf *buf);
#define git_buf_PUTS(buf, str) git_buf_put(buf, str, sizeof(str) - 1)

40
tests-clay/core/buffer.c
View File

@ -52,19 +52,19 @@ void test_core_buffer__2(void)
{
git_buf buf = GIT_BUF_INIT;
int i;
char data[100];
cl_assert(buf.size == 0);
/* this must be safe to do */
git_buf_free(&buf);
cl_assert(buf.size == 0);
cl_assert(buf.asize == 0);
/* empty buffer should be empty string */
cl_assert_strequal("", git_buf_cstr(&buf));
cl_assert(buf.size == 0);
cl_assert(buf.asize > 0);
/* cl_assert(buf.asize == 0); -- should not assume what git_buf does */
/* free should set us back to the beginning */
git_buf_free(&buf);
@ -130,6 +130,27 @@ void test_core_buffer__2(void)
cl_assert_strequal("", git_buf_cstr(&buf));
git_buf_free(&buf);
/* test extracting data into buffer */
git_buf_puts(&buf, REP4("0123456789"));
cl_assert(git_buf_oom(&buf) == 0);
git_buf_copy_cstr(data, 100, &buf);
cl_assert_strequal(data, REP4("0123456789"));
git_buf_copy_cstr(data, 11, &buf);
cl_assert_strequal(data, "0123456789");
git_buf_copy_cstr(data, 3, &buf);
cl_assert_strequal(data, "01");
git_buf_copy_cstr(data, 1, &buf);
cl_assert_strequal(data, "");
git_buf_copy_cstr(data, 100, &buf);
cl_assert_strequal(data, REP4("0123456789"));
git_buf_free(&buf);
git_buf_copy_cstr(data, 100, &buf);
cl_assert_strequal(data, "");
}
/* let's do some tests with larger buffers to push our limits */
@ -203,10 +224,7 @@ check_buf_append(
cl_assert(git_buf_oom(&tgt) == 0);
git_buf_puts(&tgt, data_b);
cl_assert(git_buf_oom(&tgt) == 0);
if (expected_data == NULL)
cl_assert(tgt.ptr == NULL);
else
cl_assert_strequal(expected_data, git_buf_cstr(&tgt));
cl_assert_strequal(expected_data, git_buf_cstr(&tgt));
cl_assert(tgt.size == expected_size);
if (expected_asize > 0)
cl_assert(tgt.asize == expected_asize);
@ -277,15 +295,15 @@ void test_core_buffer__5(void)
*/
check_buf_append("abcdefgh", "/", "abcdefgh/", 9, 16);
check_buf_append("abcdefgh", "ijklmno", "abcdefghijklmno", 15, 24);
check_buf_append("abcdefgh", "ijklmno", "abcdefghijklmno", 15, 16);
check_buf_append("abcdefgh", "ijklmnop", "abcdefghijklmnop", 16, 24);
check_buf_append("0123456789", "0123456789",
"01234567890123456789", 20, 24);
check_buf_append(REP16("x"), REP16("o"),
REP16("x") REP16("o"), 32, 40);
check_buf_append(test_4096, "", test_4096, 4096, 6144);
check_buf_append(test_4096, test_4096, test_8192, 8192, 9216);
check_buf_append(test_4096, "", test_4096, 4096, 4104);
check_buf_append(test_4096, test_4096, test_8192, 8192, 9240);
/* check sequences of appends */
check_buf_append_abc("a", "b", "c",
@ -335,13 +353,13 @@ void test_core_buffer__7(void)
b = git_buf_take_cstr(&a);
cl_assert_strequal("foo", b);
cl_assert_strequal(NULL, a.ptr);
cl_assert_strequal("", a.ptr);
git__free(b);
b = git_buf_take_cstr(&a);
cl_assert_strequal(NULL, b);
cl_assert_strequal(NULL, a.ptr);
cl_assert_strequal("", a.ptr);
git_buf_free(&a);
}