| /* |
| * 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; |
| } |