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193
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1 /*
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2
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3 This is the main source for lwcpp, the C preprocessor
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4
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5 Copyright © 2012 William Astle
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6
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7 This file is part of LWTOOLS.
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8
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9 LWTOOLS is free software: you can redistribute it and/or modify it under the
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10 terms of the GNU General Public License as published by the Free Software
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11 Foundation, either version 3 of the License, or (at your option) any later
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12 version.
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13
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14 This program is distributed in the hope that it will be useful, but WITHOUT
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15 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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16 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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17 more details.
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18
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19 You should have received a copy of the GNU General Public License along with
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20 this program. If not, see <http://www.gnu.org/licenses/>.
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21
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22 */
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23
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24 #include <stdio.h>
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25 #include <stdlib.h>
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26 #include <string.h>
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27
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28 #include <lw_alloc.h>
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29 #include <lw_string.h>
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30
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31 /* command line option handling */
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32 #define PROGVER "lwcpp from " PACKAGE_STRING
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33 char *program_name;
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34
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35 /* global state */
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36 char *output_file = NULL;
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37 int debug_level = 0;
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38
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39 static void do_help(void);
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40 static void do_usage(void);
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41
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42 /*
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43 NOTE:
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44
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45 We can't actually use a standard option parser here due to a raft of weird
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46 command line syntax and we want to be somewhat compatible with various
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47 other tools. That means we have a built-in help text that is preformatted.
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48
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49 */
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50
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51 #define OPTARG(dest,src) do { char *___s = (src); if (!*___s) { if (i < argc) ___s = argv[i++]; else { fprintf(stderr, "Option %s requires an argument\n", arg); } } (dest) = ___s; } while (0)
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52 static void parse_cmdline(int argc, char **argv)
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53 {
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54 int i = 1;
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55 int eargs = 0;
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56 char *arg;
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57
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58 while (i < argc)
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59 {
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60 arg = argv[i++];
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61 if (!eargs && arg[0] == '-' && arg[1] != 0)
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62 {
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63 /* we have an option here */
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64 if (arg[1] == '-' && arg[2] == 0)
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65 {
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66 eargs = 1;
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67 continue;
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68 }
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69
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70 /* consume the '-' */
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71 arg++;
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72 if (!strcmp(arg, "-help") || !strcmp(arg, "?"))
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73 {
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74 /* --help */
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75 do_help();
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76 exit(0);
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77 }
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78 else if (!strcmp(arg, "-usage"))
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79 {
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80 /* --usage */
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81 do_usage();
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82 exit(0);
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83 }
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84 else if (!strcmp(arg, "version") || !strcmp(arg, "-version"))
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85 {
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86 /* --version */
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87 printf("%s\n", PROGVER);
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88 exit(0);
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89 }
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90
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91 switch (*arg)
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92 {
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93 case 'o':
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94 if (output_file)
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95 lw_free(output_file);
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96 OPTARG(output_file, arg + 1);
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97 continue;
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98
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99 case 'd':
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100 if (!arg[1])
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101 debug_level = 50;
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102 else
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103 debug_level = atoi(arg + 1);
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104 continue;
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105 }
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106
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107 fprintf(stderr, "Unknown option: %s\n", arg);
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108 }
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109 else
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110 {
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111 /* we have an input file here */
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112 printf("Input file: %s\n", arg);
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113 }
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114 }
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115 }
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116
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117 /*
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118 static struct lw_cmdline_parser cmdline_parser =
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119 {
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120 options,
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121 parse_opts,
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122 "INPUTFILE",
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123 "lwcc, a HD6309 and MC6809 cross-compiler\vPlease report bugs to lost@l-w.ca.",
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124 PROGVER
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125 };
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126 */
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127 int main(int argc, char **argv)
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128 {
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129 program_name = argv[0];
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130
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131 parse_cmdline(argc, argv);
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132
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133 if (!output_file)
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134 {
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135 output_file = lw_strdup("a.out");
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136 }
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137
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138 exit(0);
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139 }
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140
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141 void do_usage(void)
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142 {
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143 printf(
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144 "Usage: %1$s [options] <input file>\n"
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145 " %1$s --help\n"
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146 " %1$s --version\n"
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147 " %1$s --usage\n",
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148 program_name
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149 );
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150 }
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151
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152 void do_help(void)
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153 {
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154 printf(
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155 "Usage: %s [options] <input file>\n"
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156 "lwcpp, the lwtools C preprocessor\n"
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157 "\n"
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158 " -d[LEVEL] enable debug output, optionally set verbosity\n"
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159 " level to LEVEL\n"
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160 " -o FILE specify the output file name\n"
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161 " -?, --help give this help message\n"
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162 " --usage print a short usage message\n"
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163 " -version, --version print program version\n"
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164 "\n"
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165 "Please report bugs to lost@l-w.ca.\n",
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166 program_name
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167 );
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168 }
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