src/printf.c

Sat, 22 Apr 2023 13:06:18 +0200

author
Mike Becker <universe@uap-core.de>
date
Sat, 22 Apr 2023 13:06:18 +0200
changeset 697
ebdce4bf262b
parent 693
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child 805
26500fc24058
permissions
-rw-r--r--

add cx_strcat_m() and cx_strcat_ma() for in-place concatenation

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1 /*
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2 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
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3 *
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4 * Copyright 2021 Mike Becker, Olaf Wintermann All rights reserved.
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5 *
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6 * Redistribution and use in source and binary forms, with or without
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7 * modification, are permitted provided that the following conditions are met:
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8 *
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9 * 1. Redistributions of source code must retain the above copyright
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10 * notice, this list of conditions and the following disclaimer.
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11 *
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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17 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
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20 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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21 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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22 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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23 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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24 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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25 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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26 * POSSIBILITY OF SUCH DAMAGE.
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27 */
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28
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29 #include "cx/printf.h"
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30
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31 #include <stdio.h>
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32 #include <string.h>
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33
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34 #ifndef CX_PRINTF_SBO_SIZE
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35 #define CX_PRINTF_SBO_SIZE 512
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36 #endif
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37
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38 int cx_fprintf(
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39 void *stream,
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40 cx_write_func wfc,
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41 char const *fmt,
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42 ...
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43 ) {
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44 int ret;
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45 va_list ap;
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46 va_start(ap, fmt);
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47 ret = cx_vfprintf(stream, wfc, fmt, ap);
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48 va_end(ap);
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49 return ret;
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50 }
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51
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52 int cx_vfprintf(
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53 void *stream,
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54 cx_write_func wfc,
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55 char const *fmt,
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56 va_list ap
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57 ) {
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58 char buf[CX_PRINTF_SBO_SIZE];
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59 va_list ap2;
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60 va_copy(ap2, ap);
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61 int ret = vsnprintf(buf, CX_PRINTF_SBO_SIZE, fmt, ap);
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62 if (ret < 0) {
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63 return ret;
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64 } else if (ret < CX_PRINTF_SBO_SIZE) {
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65 return (int) wfc(buf, 1, ret, stream);
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66 } else {
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67 int len = ret + 1;
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68 char *newbuf = malloc(len);
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69 if (!newbuf) {
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70 return -1;
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71 }
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72
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73 ret = vsnprintf(newbuf, len, fmt, ap2);
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74 if (ret > 0) {
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75 ret = (int) wfc(newbuf, 1, ret, stream);
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76 }
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77 free(newbuf);
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78 }
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79 return ret;
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80 }
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81
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82 cxmutstr cx_asprintf_a(
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83 CxAllocator const *allocator,
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84 char const *fmt,
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85 ...
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86 ) {
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87 va_list ap;
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88 cxmutstr ret;
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89 va_start(ap, fmt);
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90 ret = cx_vasprintf_a(allocator, fmt, ap);
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91 va_end(ap);
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92 return ret;
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93 }
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94
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95 cxmutstr cx_vasprintf_a(
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96 CxAllocator const *a,
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97 char const *fmt,
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98 va_list ap
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99 ) {
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100 cxmutstr s;
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101 s.ptr = NULL;
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102 s.length = 0;
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103 char buf[CX_PRINTF_SBO_SIZE];
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104 va_list ap2;
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105 va_copy(ap2, ap);
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106 int ret = vsnprintf(buf, CX_PRINTF_SBO_SIZE, fmt, ap);
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107 if (ret > 0 && ret < CX_PRINTF_SBO_SIZE) {
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108 s.ptr = cxMalloc(a, ret + 1);
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109 if (s.ptr) {
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110 s.length = (size_t) ret;
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111 memcpy(s.ptr, buf, ret);
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112 s.ptr[s.length] = '\0';
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113 }
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114 } else {
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115 int len = ret + 1;
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116 s.ptr = cxMalloc(a, len);
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117 if (s.ptr) {
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118 ret = vsnprintf(s.ptr, len, fmt, ap2);
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119 if (ret < 0) {
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120 free(s.ptr);
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121 s.ptr = NULL;
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122 } else {
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123 s.length = (size_t) ret;
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124 }
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125 }
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126 }
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127 return s;
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128 }
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129

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