| 1 | /**************************************************************************** |
| 2 | ** |
| 3 | ** Copyright (C) 2015 Intel Corporation |
| 4 | ** |
| 5 | ** Permission is hereby granted, free of charge, to any person obtaining a copy |
| 6 | ** of this software and associated documentation files (the "Software"), to deal |
| 7 | ** in the Software without restriction, including without limitation the rights |
| 8 | ** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
| 9 | ** copies of the Software, and to permit persons to whom the Software is |
| 10 | ** furnished to do so, subject to the following conditions: |
| 11 | ** |
| 12 | ** The above copyright notice and this permission notice shall be included in |
| 13 | ** all copies or substantial portions of the Software. |
| 14 | ** |
| 15 | ** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 16 | ** IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 17 | ** FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
| 18 | ** AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
| 19 | ** LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
| 20 | ** OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
| 21 | ** THE SOFTWARE. |
| 22 | ** |
| 23 | ****************************************************************************/ |
| 24 | |
| 25 | #define _BSD_SOURCE 1 |
| 26 | #define _DEFAULT_SOURCE 1 |
| 27 | #define _GNU_SOURCE 1 |
| 28 | |
| 29 | #include <sys/types.h> |
| 30 | #include <errno.h> |
| 31 | #include <stdio.h> |
| 32 | #include <stdlib.h> |
| 33 | #include <string.h> |
| 34 | |
| 35 | #if defined(__unix__) || defined(__APPLE__) |
| 36 | # include <unistd.h> |
| 37 | #endif |
| 38 | #ifdef __APPLE__ |
| 39 | typedef int RetType; |
| 40 | typedef int LenType; |
| 41 | #elif __GLIBC__ |
| 42 | typedef ssize_t RetType; |
| 43 | typedef size_t LenType; |
| 44 | #else |
| 45 | # error "Cannot implement open_memstream!" |
| 46 | #endif |
| 47 | |
| 48 | #include "compilersupport_p.h" |
| 49 | |
| 50 | struct Buffer |
| 51 | { |
| 52 | char **ptr; |
| 53 | size_t *len; |
| 54 | size_t alloc; |
| 55 | }; |
| 56 | |
| 57 | static RetType write_to_buffer(void *cookie, const char *data, LenType len) |
| 58 | { |
| 59 | struct Buffer *b = (struct Buffer *)cookie; |
| 60 | char *ptr = *b->ptr; |
| 61 | size_t newsize; |
| 62 | |
| 63 | errno = EFBIG; |
| 64 | if (unlikely(add_check_overflow(*b->len, len, &newsize))) |
| 65 | return -1; |
| 66 | |
| 67 | if (newsize >= b->alloc) { // NB! one extra byte is needed to avoid buffer overflow at close_buffer |
| 68 | // make room |
| 69 | size_t newalloc = newsize + newsize / 2 + 1; // give 50% more room |
| 70 | ptr = realloc(ptr, newalloc); |
| 71 | if (ptr == NULL) |
| 72 | return -1; |
| 73 | b->alloc = newalloc; |
| 74 | *b->ptr = ptr; |
| 75 | } |
| 76 | |
| 77 | memcpy(ptr + *b->len, data, len); |
| 78 | *b->len = newsize; |
| 79 | return len; |
| 80 | } |
| 81 | |
| 82 | static int close_buffer(void *cookie) |
| 83 | { |
| 84 | struct Buffer *b = (struct Buffer *)cookie; |
| 85 | if (*b->ptr) |
| 86 | (*b->ptr)[*b->len] = '\0'; |
| 87 | free(b); |
| 88 | return 0; |
| 89 | } |
| 90 | |
| 91 | FILE *open_memstream(char **bufptr, size_t *lenptr) |
| 92 | { |
| 93 | struct Buffer *b = (struct Buffer *)malloc(sizeof(struct Buffer)); |
| 94 | if (b == NULL) |
| 95 | return NULL; |
| 96 | b->alloc = 0; |
| 97 | b->len = lenptr; |
| 98 | b->ptr = bufptr; |
| 99 | *bufptr = NULL; |
| 100 | *lenptr = 0; |
| 101 | |
| 102 | #ifdef __APPLE__ |
| 103 | return funopen(b, NULL, write_to_buffer, NULL, close_buffer); |
| 104 | #elif __GLIBC__ |
| 105 | static const cookie_io_functions_t vtable = { |
| 106 | NULL, |
| 107 | write_to_buffer, |
| 108 | NULL, |
| 109 | close_buffer |
| 110 | }; |
| 111 | return fopencookie(b, "w", vtable); |
| 112 | #endif |
| 113 | } |
| 114 | |