src/ucx/printf.c

Sat, 25 Feb 2023 11:38:33 +0100

author
Olaf Wintermann <olaf.wintermann@gmail.com>
date
Sat, 25 Feb 2023 11:38:33 +0100
changeset 457
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parent 415
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child 490
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permissions
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update ldflags

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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 #define UCX_PRINTF_BUFSIZE 256
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35
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36 int cx_fprintf(void *stream, cx_write_func wfc, char const *fmt, ...) {
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37 int ret;
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38 va_list ap;
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39 va_start(ap, fmt);
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40 ret = cx_vfprintf(stream, wfc, fmt, ap);
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41 va_end(ap);
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42 return ret;
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43 }
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44
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45 int cx_vfprintf(void *stream, cx_write_func wfc, char const *fmt, va_list ap) {
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46 char buf[UCX_PRINTF_BUFSIZE];
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47 va_list ap2;
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48 va_copy(ap2, ap);
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49 int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
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50 if (ret < 0) {
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51 return ret;
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52 } else if (ret < UCX_PRINTF_BUFSIZE) {
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53 return (int) wfc(buf, 1, ret, stream);
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54 } else {
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55 int len = ret + 1;
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56 char *newbuf = malloc(len);
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57 if (!newbuf) {
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58 return -1;
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59 }
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60
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61 ret = vsnprintf(newbuf, len, fmt, ap2);
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62 if (ret > 0) {
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63 ret = (int) wfc(newbuf, 1, ret, stream);
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64 }
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65 free(newbuf);
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66 }
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67 return ret;
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68 }
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69
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70 cxmutstr cx_asprintf_a(CxAllocator *allocator, char const *fmt, ...) {
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71 va_list ap;
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72 cxmutstr ret;
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73 va_start(ap, fmt);
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74 ret = cx_vasprintf_a(allocator, fmt, ap);
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75 va_end(ap);
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76 return ret;
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77 }
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78
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79 cxmutstr cx_vasprintf_a(CxAllocator *a, char const *fmt, va_list ap) {
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80 cxmutstr s;
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81 s.ptr = NULL;
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82 s.length = 0;
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83 char buf[UCX_PRINTF_BUFSIZE];
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84 va_list ap2;
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85 va_copy(ap2, ap);
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86 int ret = vsnprintf(buf, UCX_PRINTF_BUFSIZE, fmt, ap);
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87 if (ret > 0 && ret < UCX_PRINTF_BUFSIZE) {
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88 s.ptr = cxMalloc(a, ret + 1);
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89 if (s.ptr) {
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90 s.length = (size_t) ret;
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91 memcpy(s.ptr, buf, ret);
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92 s.ptr[s.length] = '\0';
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93 }
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94 } else {
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95 int len = ret + 1;
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96 s.ptr = cxMalloc(a, len);
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97 if (s.ptr) {
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98 ret = vsnprintf(s.ptr, len, fmt, ap2);
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99 if (ret < 0) {
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100 free(s.ptr);
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101 s.ptr = NULL;
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102 } else {
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103 s.length = (size_t) ret;
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104 }
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105 }
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106 }
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107 return s;
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108 }
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109

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