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 */
28
29 #include "cx/printf.h"
30
31 #include <stdio.h>
32 #include <string.h>
33
34 #ifndef CX_PRINTF_SBO_SIZE
35 #define CX_PRINTF_SBO_SIZE 512
36 #endif
37
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 }
51
52 int cx_vfprintf(
53 void *stream,
54 cx_write_func wfc,
55 char const *fmt,
56 va_list ap
57 ) {
58 char buf[CX_PRINTF_SBO_SIZE];
59 va_list ap2;
60 va_copy(ap2, ap);
61 int ret = vsnprintf(buf, CX_PRINTF_SBO_SIZE, fmt, ap);
62 if (ret < 0) {
63 return ret;
64 } else if (ret < CX_PRINTF_SBO_SIZE) {
65 return (int) wfc(buf, 1, ret, stream);
66 } else {
67 int len = ret + 1;
68 char *newbuf = malloc(len);
69 if (!newbuf) {
70 return -1;
71 }
72
73 ret = vsnprintf(newbuf, len, fmt, ap2);
74 if (ret > 0) {
75 ret = (int) wfc(newbuf, 1, ret, stream);
76 }
77 free(newbuf);
78 }
79 return ret;
80 }
81
82 cxmutstr cx_asprintf_a(
83 CxAllocator const *allocator,
84 char const *fmt,
85 ...
86 ) {
87 va_list ap;
88 cxmutstr ret;
89 va_start(ap, fmt);
90 ret = cx_vasprintf_a(allocator, fmt, ap);
91 va_end(ap);
92 return ret;
93 }
94
95 cxmutstr cx_vasprintf_a(
96 CxAllocator const *a,
97 char const *fmt,
98 va_list ap
99 ) {
100 cxmutstr s;
101 s.ptr = NULL;
102 s.length = 0;
103 char buf[CX_PRINTF_SBO_SIZE];
104 va_list ap2;
105 va_copy(ap2, ap);
106 int ret = vsnprintf(buf, CX_PRINTF_SBO_SIZE, fmt, ap);
107 if (ret > 0 && ret < CX_PRINTF_SBO_SIZE) {
108 s.ptr = cxMalloc(a, ret + 1);
109 if (s.ptr) {
110 s.length = (size_t) ret;
111 memcpy(s.ptr, buf, ret);
112 s.ptr[s.length] = '\0';
113 }
114 } else {
115 int len = ret + 1;
116 s.ptr = cxMalloc(a, len);
117 if (s.ptr) {
118 ret = vsnprintf(s.ptr, len, fmt, ap2);
119 if (ret < 0) {
120 free(s.ptr);
121 s.ptr = NULL;
122 } else {
123 s.length = (size_t) ret;
124 }
125 }
126 }
127 return s;
128 }
129
130