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annotate libmlk-util/mlk/util/util.h @ 557:944798a59b8a

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util: introduce mlk_util_die
author David Demelier <markand@malikania.fr>
date Wed, 08 Mar 2023 13:17:38 +0100
parents 3663e92842dc
children a2443afe8a1f
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1 /*
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2 * util.h -- miscellaneous utilities and portability
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3 *
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4 * Copyright (c) 2020-2023 David Demelier <markand@malikania.fr>
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5 *
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6 * Permission to use, copy, modify, and/or distribute this software for any
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7 * purpose with or without fee is hereby granted, provided that the above
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8 * copyright notice and this permission notice appear in all copies.
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9 *
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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17 */
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18
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19 #ifndef MLK_UTIL_UTIL_H
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20 #define MLK_UTIL_UTIL_H
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22 /**
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23 * \file mlk/util/util.h
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24 * \brief Miscellaneous utilities and portability
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25 */
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26
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27 #include <limits.h>
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28 #include <stdio.h>
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30 /*
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31 * This file helps finding what are the available features accross the various
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32 * operating system in the landscape.
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33 *
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34 * The following macros are automatically set depending on the operating
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35 * system:
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36 *
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37 * - MLK_OS_WINDOWS: running on any Windows machine
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38 * - MLK_OS_POSIX: every mostly POSIX systems
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39 *
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40 * The following macro will be automatically defined unless the user override
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41 * them:
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42 *
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43 * - MLK_HAS_FMEMOPEN: defined if fmemopen function is available.
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44 * - MLK_HAS_SSIZE_T: defined if ssize_t typedef is available.
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45 */
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46
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47 #if defined(_WIN32)
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48 # define MLK_OS_WINDOWS
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49 #elif defined(__FreeBSD__)
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50 # define MLK_OS_POSIX
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51 #elif defined(__DragonFly__)
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52 # define MLK_OS_POSIX
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53 #elif defined(__OpenBSD__)
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54 # define MLK_OS_POSIX
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55 #elif defined(__NetBSD__)
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56 # define MLK_OS_POSIX
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57 #elif defined(__linux__)
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58 # define MLK_OS_POSIX
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59 #elif defined(__APPLE__)
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60 # define MLK_OS_POSIX
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61 # define MLK_OS_APPLE
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62 #endif
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63
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64 #if defined(PATH_MAX)
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65 # define MLK_PATH_MAX PATH_MAX
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66 #elif defined(_POSIX_PATH_MAX)
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67 # define MLK_PATH_MAX _POSIX_PATH_MAX
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68 #else
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69 # define MLK_PATH_MAX 4096
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70 #endif
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72 #if defined(MLK_OS_POSIX) && !defined(MLK_HAS_SSIZE_T)
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73 # define MLK_HAS_SSIZE_T
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74 #endif
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75
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76 #if !defined(MLK_HAS_SSIZE_T)
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77 typedef long long int ssize_t;
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78 #endif
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80 #if defined(MLK_OS_POSIX) && !defined(MLK_HAS_FMEMOPEN)
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81 # define MLK_HAS_FMEMOPEN
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82 #endif
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83
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84 #if defined(__cplusplus)
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85 extern "C" {
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86 #endif
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87
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88 /**
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89 * Print a fatal message and exit with code 1.
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90 *
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91 * \pre fmt != NULL
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92 * \param fmt the printf format string
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93 */
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94 void
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95 mlk_util_die(const char *fmt, ...);
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96
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97 /**
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98 * Compatibility version of OpenBSD [strlcpy].
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99 *
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100 * [strlcpy]: http://man.openbsd.org/strlcpy
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101 */
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102 size_t
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103 mlk_util_strlcpy(char *dst, const char *src, size_t dstsz);
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104
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105 /**
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106 * Compatibility version of OpenBSD [strlcat].
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107 *
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108 * [strlcat]: http://man.openbsd.org/strlcat
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109 */
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110 size_t
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111 mlk_util_strlcat(char *dst, const char *src, size_t dstsz);
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112
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113 FILE *
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114 mlk_util_fmemopen(void *, size_t, const char *);
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115
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116 /**
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117 * Portable version of POSIX [basename].
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118 *
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119 * [basename]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/basename.html
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120 */
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121 char *
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122 mlk_util_basename(char *);
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123
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124 /**
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125 * Portable version of POSIX [dirname].
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126 *
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127 * [dirname]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/dirname.html
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128 */
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129 char *
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130 mlk_util_dirname(char *);
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131
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132 extern int mlk_util_opterr;
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133 extern int mlk_util_optind;
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134 extern int mlk_util_optopt;
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135 extern char *mlk_util_optarg;
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136
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137 /**
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138 * Portable version of POSIX [getopt].
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139 *
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140 * All variables that the standard getopt uses are prefixed with `mlk_util_`.
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141 *
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142 * - optarg -> mlk_util_optarg
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143 * - opterr -> mlk_util_opterr
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144 * - optind -> mlk_util_optind
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145 * - optopt -> mlk_util_optopt
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146 *
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147 * [getopt]: https://pubs.opengroup.org/onlinepubs/9699919799/functions/getopt.html
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148 */
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149 int
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150 mlk_util_getopt(int argc, char **argv, const char *optstring);
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151
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152 #if defined(__cplusplus)
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153 }
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154 #endif
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155
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156 #endif /* !MLK_UTIL_UTIL_H */