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/*
* Copyright © 2017 Thomas Helland
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
#include "string_buffer.h"
static bool
ensure_capacity(struct _mesa_string_buffer *str, uint32_t needed_capacity)
{
if (needed_capacity <= str->capacity)
return true;
/* Too small, double until we can fit the new string */
uint32_t new_capacity = str->capacity * 2;
while (needed_capacity > new_capacity)
new_capacity *= 2;
str->buf = reralloc_array_size(str, str->buf, sizeof(char), new_capacity);
if (str->buf == NULL)
return false;
str->capacity = new_capacity;
return true;
}
struct _mesa_string_buffer *
_mesa_string_buffer_create(void *mem_ctx, uint32_t initial_capacity)
{
struct _mesa_string_buffer *str;
str = ralloc(mem_ctx, struct _mesa_string_buffer);
if (str == NULL)
return NULL;
/* If no initial capacity is set then set it to something */
str->capacity = initial_capacity ? initial_capacity : 32;
str->buf = ralloc_array(str, char, str->capacity);
if (!str->buf) {
ralloc_free(str);
return NULL;
}
str->length = 0;
str->buf[str->length] = '\0';
return str;
}
bool
_mesa_string_buffer_append_all(struct _mesa_string_buffer *str,
uint32_t num_args, ...)
{
int i;
char* s;
va_list args;
va_start(args, num_args);
for (i = 0; i < num_args; i++) {
s = va_arg(args, char*);
if (!_mesa_string_buffer_append_len(str, s, strlen(s))) {
va_end(args);
return false;
}
}
va_end(args);
return true;
}
bool
_mesa_string_buffer_append_len(struct _mesa_string_buffer *str,
const char *c, uint32_t len)
{
uint32_t needed_length = str->length + len + 1;
/* Check if we're overflowing uint32_t */
if (needed_length < str->length)
return false;
if (!ensure_capacity(str, needed_length))
return false;
memcpy(str->buf + str->length, c, len);
str->length += len;
str->buf[str->length] = '\0';
return true;
}
bool
_mesa_string_buffer_vprintf(struct _mesa_string_buffer *str,
const char *format, va_list args)
{
/* We're looping two times to avoid duplicating code */
for (uint32_t i = 0; i < 2; i++) {
va_list arg_copy;
va_copy(arg_copy, args);
uint32_t space_left = str->capacity - str->length;
int32_t len = vsnprintf(str->buf + str->length,
space_left, format, arg_copy);
va_end(arg_copy);
/* Error in vsnprintf() or measured len overflows size_t */
if (unlikely(len < 0 || str->length + len + 1 < str->length))
return false;
/* There was enough space for the string; we're done */
if (len < space_left) {
str->length += len;
return true;
}
/* Not enough space, resize and retry */
ensure_capacity(str, str->length + len + 1);
}
return false;
}
bool
_mesa_string_buffer_printf(struct _mesa_string_buffer *str,
const char *format, ...)
{
bool res;
va_list args;
va_start(args, format);
res = _mesa_string_buffer_vprintf(str, format, args);
va_end(args);
return res;
}
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