1 | /*
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2 | * docproc is a simple preprocessor for the template files
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3 | * used as placeholders for the kernel internal documentation.
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4 | * docproc is used for documentation-frontend and
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5 | * dependency-generator.
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6 | * The two usages have in common that they require
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7 | * some knowledge of the .tmpl syntax, therefore they
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8 | * are kept together.
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9 | *
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10 | * documentation-frontend
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11 | * Scans the template file and call kernel-doc for
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12 | * all occurrences of ![EIF]file
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13 | * Beforehand each referenced file are scanned for
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14 | * any exported sympols "EXPORT_SYMBOL()" statements.
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15 | * This is used to create proper -function and
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16 | * -nofunction arguments in calls to kernel-doc.
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17 | * Usage: docproc doc file.tmpl
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18 | *
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19 | * dependency-generator:
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20 | * Scans the template file and list all files
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21 | * referenced in a format recognized by make.
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22 | * Usage: docproc depend file.tmpl
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23 | * Writes dependency information to stdout
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24 | * in the following format:
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25 | * file.tmpl src.c src2.c
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26 | * The filenames are obtained from the following constructs:
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27 | * !Efilename
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28 | * !Ifilename
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29 | * !Dfilename
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30 | * !Ffilename
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31 | *
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32 | */
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33 |
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34 | #include <stdio.h>
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35 | #include <stdlib.h>
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36 | #include <string.h>
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37 | #include <ctype.h>
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38 | #include <unistd.h>
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39 | #include <limits.h>
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40 | #include <sys/types.h>
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41 | #include <sys/wait.h>
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42 |
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43 | /* exitstatus is used to keep track of any failing calls to kernel-doc,
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44 | * but execution continues. */
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45 | int exitstatus = 0;
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46 |
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47 | typedef void DFL(char *);
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48 | DFL *defaultline;
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49 |
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50 | typedef void FILEONLY(char * file);
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51 | FILEONLY *internalfunctions;
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52 | FILEONLY *externalfunctions;
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53 | FILEONLY *symbolsonly;
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54 |
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55 | typedef void FILELINE(char * file, char * line);
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56 | FILELINE * singlefunctions;
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57 | FILELINE * entity_system;
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58 |
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59 | #define MAXLINESZ 2048
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60 | #define MAXFILES 250
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61 | #define KERNELDOCPATH "scripts/"
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62 | #define KERNELDOC "kernel-doc"
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63 | #define DOCBOOK "-docbook"
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64 | #define FUNCTION "-function"
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65 | #define NOFUNCTION "-nofunction"
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66 |
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67 | void usage (void)
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68 | {
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69 | fprintf(stderr, "Usage: docproc {doc|depend} file\n");
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70 | fprintf(stderr, "Input is read from file.tmpl. Output is sent to stdout\n");
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71 | fprintf(stderr, "doc: frontend when generating kernel documentation\n");
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72 | fprintf(stderr, "depend: generate list of files referenced within file\n");
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73 | }
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74 |
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75 | /*
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76 | * Execute kernel-doc with parameters givin in svec
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77 | */
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78 | void exec_kernel_doc(char **svec)
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79 | {
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80 | pid_t pid;
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81 | int ret;
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82 | char *real_filename;
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83 | int rflen;
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84 |
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85 | /* Make sure output generated so far are flushed */
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86 | fflush(stdout);
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87 | switch(pid=fork()) {
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88 | case -1:
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89 | perror("vfork"+1);
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90 | exit(1);
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91 | case 0:
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92 | rflen = strlen(getenv("SRCTREE"));
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93 | rflen += strlen(KERNELDOCPATH KERNELDOC);
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94 | real_filename = alloca(rflen + 1);
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95 | strcpy(real_filename, getenv("SRCTREE"));
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96 | strcat(real_filename, KERNELDOCPATH KERNELDOC);
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97 | execvp(real_filename, svec);
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98 | fprintf(stderr, "exec ");
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99 | perror(real_filename);
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100 | exit(1);
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101 | default:
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102 | waitpid(pid, &ret ,0);
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103 | }
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104 | if (WIFEXITED(ret))
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105 | exitstatus |= WEXITSTATUS(ret);
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106 | else
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107 | exitstatus = 0xff;
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108 | }
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109 |
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110 | /* Types used to create list of all exported symbols in a number of files */
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111 | struct symbols
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112 | {
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113 | char *name;
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114 | };
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115 |
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116 | struct symfile
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117 | {
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118 | char *filename;
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119 | struct symbols *symbollist;
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120 | int symbolcnt;
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121 | };
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122 |
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123 | struct symfile symfilelist[MAXFILES];
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124 | int symfilecnt = 0;
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125 |
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126 | void add_new_symbol(struct symfile *sym, char * symname)
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127 | {
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128 | sym->symbollist =
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129 | realloc(sym->symbollist, (sym->symbolcnt + 1) * sizeof(char *));
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130 | sym->symbollist[sym->symbolcnt++].name = strdup(symname);
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131 | }
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132 |
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133 | /* Add a filename to the list */
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134 | struct symfile * add_new_file(char * filename)
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135 | {
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136 | symfilelist[symfilecnt++].filename = strdup(filename);
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137 | return &symfilelist[symfilecnt - 1];
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138 | }
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139 | /* Check if file already are present in the list */
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140 | struct symfile * filename_exist(char * filename)
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141 | {
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142 | int i;
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143 | for (i=0; i < symfilecnt; i++)
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144 | if (strcmp(symfilelist[i].filename, filename) == 0)
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145 | return &symfilelist[i];
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146 | return NULL;
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147 | }
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148 |
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149 | /*
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150 | * List all files referenced within the template file.
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151 | * Files are separated by tabs.
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152 | */
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153 | void adddep(char * file) { printf("\t%s", file); }
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154 | void adddep2(char * file, char * line) { line = line; adddep(file); }
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155 | void noaction(char * line) { line = line; }
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156 | void noaction2(char * file, char * line) { file = file; line = line; }
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157 |
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158 | /* Echo the line without further action */
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159 | void printline(char * line) { printf("%s", line); }
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160 |
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161 | /*
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162 | * Find all symbols exported with EXPORT_SYMBOL and EXPORT_SYMBOL_GPL
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163 | * in filename.
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164 | * All symbols located are stored in symfilelist.
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165 | */
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166 | void find_export_symbols(char * filename)
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167 | {
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168 | FILE * fp;
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169 | struct symfile *sym;
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170 | char line[MAXLINESZ];
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171 | if (filename_exist(filename) == NULL) {
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172 | int rflen = strlen(getenv("SRCTREE")) + strlen(filename);
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173 | char *real_filename = alloca(rflen + 1);
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174 | strcpy(real_filename, getenv("SRCTREE"));
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175 | strcat(real_filename, filename);
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176 | sym = add_new_file(filename);
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177 | fp = fopen(real_filename, "r");
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178 | if (fp == NULL)
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179 | {
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180 | fprintf(stderr, "docproc: ");
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181 | perror(real_filename);
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182 | }
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183 | while (fgets(line, MAXLINESZ, fp)) {
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184 | char *p;
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185 | char *e;
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186 | if (((p = strstr(line, "EXPORT_SYMBOL_GPL")) != 0) ||
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187 | ((p = strstr(line, "EXPORT_SYMBOL")) != 0)) {
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188 | /* Skip EXPORT_SYMBOL{_GPL} */
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189 | while (isalnum(*p) || *p == '_')
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190 | p++;
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191 | /* Remove paranteses and additional ws */
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192 | while (isspace(*p))
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193 | p++;
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194 | if (*p != '(')
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195 | continue; /* Syntax error? */
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196 | else
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197 | p++;
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198 | while (isspace(*p))
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199 | p++;
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200 | e = p;
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201 | while (isalnum(*e) || *e == '_')
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202 | e++;
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203 | *e = '\0';
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204 | add_new_symbol(sym, p);
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205 | }
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206 | }
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207 | fclose(fp);
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208 | }
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209 | }
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210 |
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211 | /*
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212 | * Document all external or internal functions in a file.
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213 | * Call kernel-doc with following parameters:
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214 | * kernel-doc -docbook -nofunction function_name1 filename
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215 | * function names are obtained from all the the src files
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216 | * by find_export_symbols.
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217 | * intfunc uses -nofunction
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218 | * extfunc uses -function
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219 | */
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220 | void docfunctions(char * filename, char * type)
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221 | {
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222 | int i,j;
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223 | int symcnt = 0;
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224 | int idx = 0;
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225 | char **vec;
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226 |
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227 | for (i=0; i <= symfilecnt; i++)
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228 | symcnt += symfilelist[i].symbolcnt;
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229 | vec = malloc((2 + 2 * symcnt + 2) * sizeof(char*));
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230 | if (vec == NULL) {
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231 | perror("docproc: ");
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232 | exit(1);
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233 | }
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234 | vec[idx++] = KERNELDOC;
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235 | vec[idx++] = DOCBOOK;
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236 | for (i=0; i < symfilecnt; i++) {
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237 | struct symfile * sym = &symfilelist[i];
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238 | for (j=0; j < sym->symbolcnt; j++) {
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239 | vec[idx++] = type;
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240 | vec[idx++] = sym->symbollist[j].name;
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241 | }
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242 | }
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243 | vec[idx++] = filename;
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244 | vec[idx] = NULL;
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245 | printf("<!-- %s -->\n", filename);
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246 | exec_kernel_doc(vec);
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247 | fflush(stdout);
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248 | free(vec);
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249 | }
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250 | void intfunc(char * filename) { docfunctions(filename, NOFUNCTION); }
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251 | void extfunc(char * filename) { docfunctions(filename, FUNCTION); }
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252 |
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253 | /*
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254 | * Document specific function(s) in a file.
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255 | * Call kernel-doc with the following parameters:
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256 | * kernel-doc -docbook -function function1 [-function function2]
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257 | */
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258 | void singfunc(char * filename, char * line)
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259 | {
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260 | char *vec[200]; /* Enough for specific functions */
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261 | int i, idx = 0;
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262 | int startofsym = 1;
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263 | vec[idx++] = KERNELDOC;
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264 | vec[idx++] = DOCBOOK;
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265 |
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266 | /* Split line up in individual parameters preceeded by FUNCTION */
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267 | for (i=0; line[i]; i++) {
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268 | if (isspace(line[i])) {
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269 | line[i] = '\0';
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270 | startofsym = 1;
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271 | continue;
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272 | }
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273 | if (startofsym) {
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274 | startofsym = 0;
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275 | vec[idx++] = FUNCTION;
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276 | vec[idx++] = &line[i];
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277 | }
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278 | }
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279 | vec[idx++] = filename;
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280 | vec[idx] = NULL;
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281 | exec_kernel_doc(vec);
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282 | }
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283 |
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284 | /*
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285 | * Parse file, calling action specific functions for:
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286 | * 1) Lines containing !E
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287 | * 2) Lines containing !I
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288 | * 3) Lines containing !D
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289 | * 4) Lines containing !F
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290 | * 5) Default lines - lines not matching the above
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291 | */
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292 | void parse_file(FILE *infile)
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293 | {
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294 | char line[MAXLINESZ];
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295 | char * s;
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296 | while (fgets(line, MAXLINESZ, infile)) {
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297 | if (line[0] == '!') {
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298 | s = line + 2;
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299 | switch (line[1]) {
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300 | case 'E':
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301 | while (*s && !isspace(*s)) s++;
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302 | *s = '\0';
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303 | externalfunctions(line+2);
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304 | break;
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305 | case 'I':
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306 | while (*s && !isspace(*s)) s++;
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307 | *s = '\0';
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308 | internalfunctions(line+2);
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309 | break;
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310 | case 'D':
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311 | while (*s && !isspace(*s)) s++;
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312 | *s = '\0';
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313 | symbolsonly(line+2);
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314 | break;
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315 | case 'F':
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316 | /* filename */
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317 | while (*s && !isspace(*s)) s++;
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318 | *s++ = '\0';
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319 | /* function names */
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320 | while (isspace(*s))
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321 | s++;
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322 | singlefunctions(line +2, s);
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323 | break;
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324 | default:
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325 | defaultline(line);
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326 | }
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327 | }
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328 | else {
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329 | defaultline(line);
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330 | }
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331 | }
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332 | fflush(stdout);
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333 | }
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334 |
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335 |
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336 | int main(int argc, char **argv)
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337 | {
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338 | FILE * infile;
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339 | if (argc != 3) {
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340 | usage();
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341 | exit(1);
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342 | }
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343 | /* Open file, exit on error */
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344 | infile = fopen(argv[2], "r");
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345 | if (infile == NULL) {
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346 | fprintf(stderr, "docproc: ");
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347 | perror(argv[2]);
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348 | exit(2);
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349 | }
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350 |
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351 | if (strcmp("doc", argv[1]) == 0)
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352 | {
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353 | /* Need to do this in two passes.
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354 | * First pass is used to collect all symbols exported
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355 | * in the various files.
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356 | * Second pass generate the documentation.
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357 | * This is required because function are declared
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358 | * and exported in different files :-((
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359 | */
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360 | /* Collect symbols */
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361 | defaultline = noaction;
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362 | internalfunctions = find_export_symbols;
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363 | externalfunctions = find_export_symbols;
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364 | symbolsonly = find_export_symbols;
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365 | singlefunctions = noaction2;
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366 | parse_file(infile);
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367 |
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368 | /* Rewind to start from beginning of file again */
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369 | fseek(infile, 0, SEEK_SET);
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370 | defaultline = printline;
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371 | internalfunctions = intfunc;
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372 | externalfunctions = extfunc;
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373 | symbolsonly = printline;
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374 | singlefunctions = singfunc;
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375 |
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376 | parse_file(infile);
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377 | }
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378 | else if (strcmp("depend", argv[1]) == 0)
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379 | {
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380 | /* Create first part of dependency chain
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381 | * file.tmpl */
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382 | printf("%s\t", argv[2]);
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383 | defaultline = noaction;
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384 | internalfunctions = adddep;
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385 | externalfunctions = adddep;
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386 | symbolsonly = adddep;
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387 | singlefunctions = adddep2;
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388 | parse_file(infile);
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389 | printf("\n");
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390 | }
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391 | else
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392 | {
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393 | fprintf(stderr, "Unknown option: %s\n", argv[1]);
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394 | exit(1);
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395 | }
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396 | fclose(infile);
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397 | fflush(stdout);
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398 | return exitstatus;
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399 | }
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