Mercurial > hg > toybox

annotate scripts/mkflags.c @ 1566:62a7d617e1ce draft 0.5.1

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Make md5sum and sha1sum work on big endian systems.
author Rob Landley <rob@landley.net>
date Wed, 19 Nov 2014 21:38:00 -0600
parents 23817e1675f2
children 5fac2769a159
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 // Take three word input lines on stdin (the three space separated words are
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2 // command name, option string with current config, option string from
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3 // allyesconfig; space separated, the last two are and double quotes)
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4 // and produce flag #defines to stdout.
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5
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6 // This is intentionally crappy code because we control the inputs. It leaks
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7 // memory like a sieve and segfaults if malloc returns null, but does the job.
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8
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9 #include <stdio.h>
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10 #include <stdlib.h>
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11 #include <string.h>
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12 #include <errno.h>
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13
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14 struct flag {
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15 struct flag *next;
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16 char *command;
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17 struct flag *lopt;
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18 };
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19
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20 // Break down a command string into struct flag list.
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21
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22 struct flag *digest(char *string)
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23 {
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24 struct flag *list = NULL;
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25
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26 while (*string) {
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27 // Groups must be at end.
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28 if (*string == '[') break;
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29
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30 // Longopts
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31 if (*string == '(') {
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32 struct flag *new = calloc(sizeof(struct flag), 1);
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33
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34 new->command = ++string;
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35
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36 // Attach longopt to previous short opt, if any.
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37 if (list && list->command) {
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38 new->next = list->lopt;
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39 list->lopt = new;
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40 } else {
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41 struct flag *blank = calloc(sizeof(struct flag), 1);
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42
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43 blank->next = list;
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44 blank->lopt = new;
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45 list = blank;
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46 }
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47 // An empty longopt () would break this.
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48 while (*++string != ')') if (*string == '-') *string = '_';
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49 *(string++) = 0;
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50 continue;
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51 }
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52
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53 if (strchr("?&^-:#|@*; ", *string)) string++;
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54 else if (strchr("=<>", *string)) {
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55 while (isdigit(*++string)) {
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56 if (!list) {
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57 string++;
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58 break;
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59 }
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60 }
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61 } else {
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62 struct flag *new = calloc(sizeof(struct flag), 1);
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63
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64 new->command = string++;
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65 new->next = list;
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66 list = new;
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67 }
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68 }
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69
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70 return list;
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71 }
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72
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73 int main(int argc, char *argv[])
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74 {
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75 char command[256], flags[1023], allflags[1024];
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76 char *out, *outbuf = malloc(1024*1024);
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78 // Yes, the output buffer is 1 megabyte with no bounds checking.
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79 // See "intentionally crappy", above.
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80 if (!(out = outbuf)) return 1;
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81
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82 for (;;) {
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83 struct flag *flist, *aflist, *offlist;
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84 unsigned bit;
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85
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86 *command = 0;
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87 bit = fscanf(stdin, "%255s \"%1023[^\"]\" \"%1023[^\"]\"\n",
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88 command, flags, allflags);
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89
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90 if (!*command) break;
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91 if (bit != 3) {
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92 fprintf(stderr, "\nError in %s (duplicate command?)\n", command);
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93 exit(1);
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94 }
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95
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96 bit = 0;
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97 printf("// %s %s %s\n", command, flags, allflags);
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98
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99 flist = digest(flags);
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100 offlist = aflist = digest(allflags);
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101
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102 printf("#ifdef CLEANUP_%s\n#undef CLEANUP_%s\n#undef FOR_%s\n",
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103 command, command, command);
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104
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105 while (offlist) {
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106 struct flag *f = offlist->lopt;
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107 while (f) {
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108 printf("#undef FLAG_%s\n", f->command);
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109 f = f->next;
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110 }
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111 if (offlist->command) printf("#undef FLAG_%c\n", *offlist->command);
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112 offlist = offlist->next;
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113 }
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114 printf("#endif\n\n");
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115
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116 sprintf(out, "#ifdef FOR_%s\n#ifndef TT\n#define TT this.%s\n#endif\n",
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117 command, command);
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118 out += strlen(out);
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119
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120 while (aflist) {
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121 if (aflist->lopt) {
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122 if (flist && flist->lopt &&
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123 !strcmp(flist->lopt->command, aflist->lopt->command))
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124 {
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125 sprintf(out, "#define FLAG_%s (1<<%d)\n", flist->lopt->command, bit);
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126 flist->lopt = flist->lopt->next;
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127 } else sprintf(out, "#define FLAG_%s 0\n", aflist->lopt->command);
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128 aflist->lopt = aflist->lopt->next;
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129 if (!aflist->command) {
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130 aflist = aflist->next;
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131 if (flist) {
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132 flist = flist->next;
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133 bit++;
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134 }
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135 }
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136 } else if (aflist->command) {
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137 if (flist && (!aflist->command || *aflist->command == *flist->command))
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138 {
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139 if (aflist->command)
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140 sprintf(out, "#define FLAG_%c (1<<%d)\n", *aflist->command, bit);
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141 bit++;
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142 flist = flist->next;
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143 } else sprintf(out, "#define FLAG_%c 0\n", *aflist->command);
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144 aflist = aflist->next;
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145 }
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146 out += strlen(out);
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147 }
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148 sprintf(out, "#endif\n\n");
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149 out += strlen(out);
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150 }
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151
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152 if (fflush(0) && ferror(stdout)) return 1;
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153
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154 out = outbuf;
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155 while (*out) {
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156 int i = write(1, outbuf, strlen(outbuf));
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157
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158 if (i<0) return 1;
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159 out += i;
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160 }
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161 }