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annotate helpgen/helpgen.c @ 7:57b2cc9b87f7

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Use memcpy instead of strncpy when we know the length anyway. Modern gcc seems to think it knows how to detect misuse of strncpy, but it's wrong (in fact: very, very wrong) and the path of least resistance is to not try to fight with it.
author David A. Holland
date Mon, 30 May 2022 23:47:52 -0400
parents 13d2b8934445
children
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1 #include <getopt.h>
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2 #include <stdio.h>
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3 #include <stdlib.h>
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4 #include <string.h>
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5
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6 #include "utils.h"
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7 #include "topic.h"
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8 #include "helpgen.h"
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9
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10
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11 #define MAXTOPICS 512
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12 #define MAXTOTTITLES (MAXTOPICS*4)
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13
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14 static struct topic *topics[MAXTOPICS];
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15 static int ntopics;
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16
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17 void help_addtopic(struct topic *t) {
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18 if (ntopics >= MAXTOPICS) {
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19 fprintf(stderr, "Too many help topics (increase MAXTOPICS)\n");
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20 exit(1);
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21 }
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22 topics[ntopics++] = t;
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23 }
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24
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25 ////////////////////////////////////////////////////////////
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26
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27 static int titlesort(const void *av, const void *bv) {
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28 const char *a = *(const char *const *)av;
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29 const char *b = *(const char *const *)bv;
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30 return strcasecmp(a, b);
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31 }
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32
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33 static int titlefind(const void *av, const void *bv) {
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34 const char *a = (const char *)av;
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35 const char *b = *(const char *const *)bv;
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36 return strcasecmp(a, b);
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37 }
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38
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39 static void checkxrefs(void) {
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40 // check for dangling xrefs and duplicate titles
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41
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42 const char *alltitles[MAXTOTTITLES];
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43 int ntitles = 0;
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44
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45 int i, j, n;
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46 int bad = 0;
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47
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48 for (i=0; i<ntopics; i++) {
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49 n = topic_getnumtitles(topics[i]);
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50 for (j=0; j<n; j++) {
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51 if (ntitles >= MAXTOTTITLES) {
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52 fprintf(stderr, "MAXTOTTITLES too small\n");
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53 exit(1);
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54 }
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55 alltitles[ntitles++] = topic_gettitle(topics[i], j);
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56 }
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57 }
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58
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59 qsort(alltitles, ntitles, sizeof(alltitles[0]), titlesort);
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60
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61 // check for dups
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62 for (i=1; i<ntitles; i++) {
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63 if (!strcasecmp(alltitles[i], alltitles[i-1])) {
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64 fprintf(stderr, "Duplicate title %s\n", alltitles[i]);
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65 bad = 1;
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66 }
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67 }
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68
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69 // check refs
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70 for (i=0; i<ntopics; i++) {
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71 n = topic_getnumrefs(topics[i]);
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72 for (j=0; j<n; j++) {
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73 const char *ref;
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74 const void *result;
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75
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76 ref = topic_getref(topics[i], j);
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77 result = bsearch(ref, alltitles, ntitles, sizeof(alltitles[0]),
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78 titlefind);
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79 if (!result) {
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80 char *ref2;
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81 size_t reflen;
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82
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83 reflen = strlen(ref);
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84 ref2 = dostrdup(ref);
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85 if (reflen > 0 && ref2[reflen-1]=='s') {
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86 ref2[reflen-1] = 0;
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87 result = bsearch(ref2, alltitles, ntitles, sizeof(alltitles[0]),
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88 titlefind);
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89 }
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90 free(ref2);
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91 }
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92
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93 if (!result) {
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94 fprintf(stderr, "Dangling crossreference %s from %s\n", ref,
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95 topic_gettitle(topics[i], 0));
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96 bad = 1;
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97 }
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98 }
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99 }
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100
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101 if (bad) {
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102 exit(1);
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103 }
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104 }
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105
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106 ////////////////////////////////////////////////////////////
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107
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108 static void usage(const char *av0) {
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109 fprintf(stderr, "usage: %s [-t type] infile outfile\n", av0);
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110 fprintf(stderr, " type may be: c html\n");
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111 exit(1);
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112 }
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113
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114 int main(int argc, char *argv[]) {
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115 void (*outfunc)(const char *, struct topic **, int);
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116 const char *outputtype = "c";
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117 int ch;
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118
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119 while ((ch = getopt(argc, argv, "t:"))!=-1) {
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120 switch (ch) {
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121 case 't': outputtype = optarg; break;
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122 default: usage(argv[0]); break;
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123 }
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124 }
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125 if (optind != argc-2) {
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126 usage(argv[0]);
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127 }
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128
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129 const char *infile = argv[optind++];
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130 const char *outfile = argv[optind++];
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131
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132 if (!strcmp(outputtype, "c")) {
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133 outfunc = cout;
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134 }
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135 else if (!strcmp(outputtype, "html")) {
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136 outfunc = htmlout;
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137 }
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138 else {
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139 usage(argv[0]);
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140 }
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141
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142 load(infile);
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143 checkxrefs();
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144 outfunc(outfile, topics, ntopics);
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145
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146 return 0;
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147 }