Wed, 01 Feb 2023 18:06:50 +0100
#228 make buffer sizes adjustable at compile time
1 /*
2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
3 *
4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 *
16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
26 * POSSIBILITY OF SUCH DAMAGE.
27 */
29 #include "cx/printf.h"
31 #include <stdio.h>
32 #include <string.h>
34 #ifndef CX_PRINTF_SBO_SIZE
35 #define CX_PRINTF_SBO_SIZE 512
36 #endif
38 int cx_fprintf(
39 void *stream,
40 cx_write_func wfc,
41 char const *fmt,
42 ...
43 ) {
44 int ret;
45 va_list ap;
46 va_start(ap, fmt);
47 ret = cx_vfprintf(stream, wfc, fmt, ap);
48 va_end(ap);
49 return ret;
50 }
52 int cx_vfprintf(void *stream, cx_write_func wfc, char const *fmt, va_list ap) {
53 char buf[CX_PRINTF_SBO_SIZE];
54 va_list ap2;
55 va_copy(ap2, ap);
56 int ret = vsnprintf(buf, CX_PRINTF_SBO_SIZE, fmt, ap);
57 if (ret < 0) {
58 return ret;
59 } else if (ret < CX_PRINTF_SBO_SIZE) {
60 return (int) wfc(buf, 1, ret, stream);
61 } else {
62 int len = ret + 1;
63 char *newbuf = malloc(len);
64 if (!newbuf) {
65 return -1;
66 }
68 ret = vsnprintf(newbuf, len, fmt, ap2);
69 if (ret > 0) {
70 ret = (int) wfc(newbuf, 1, ret, stream);
71 }
72 free(newbuf);
73 }
74 return ret;
75 }
77 cxmutstr cx_asprintf_a(CxAllocator *allocator, char const *fmt, ...) {
78 va_list ap;
79 cxmutstr ret;
80 va_start(ap, fmt);
81 ret = cx_vasprintf_a(allocator, fmt, ap);
82 va_end(ap);
83 return ret;
84 }
86 cxmutstr cx_vasprintf_a(CxAllocator *a, char const *fmt, va_list ap) {
87 cxmutstr s;
88 s.ptr = NULL;
89 s.length = 0;
90 char buf[CX_PRINTF_SBO_SIZE];
91 va_list ap2;
92 va_copy(ap2, ap);
93 int ret = vsnprintf(buf, CX_PRINTF_SBO_SIZE, fmt, ap);
94 if (ret > 0 && ret < CX_PRINTF_SBO_SIZE) {
95 s.ptr = cxMalloc(a, ret + 1);
96 if (s.ptr) {
97 s.length = (size_t) ret;
98 memcpy(s.ptr, buf, ret);
99 s.ptr[s.length] = '\0';
100 }
101 } else {
102 int len = ret + 1;
103 s.ptr = cxMalloc(a, len);
104 if (s.ptr) {
105 ret = vsnprintf(s.ptr, len, fmt, ap2);
106 if (ret < 0) {
107 free(s.ptr);
108 s.ptr = NULL;
109 } else {
110 s.length = (size_t) ret;
111 }
112 }
113 }
114 return s;
115 }