misc/cdepcalc.c

   1 /*
   2  * Copyright (c) 2006-2008 Ed Schouten <ed@80386.nl>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/types.h>
  28 #include <dirent.h>
  29 #include <stdio.h>
  30 #include <stdlib.h>
  31 #include <string.h>
  32
  33 struct header;
  34 struct header_depend;
  35
  36 struct header {
  37         char *filename;
  38         struct header_depend *depends;
  39         struct header *next;
  40 };
  41
  42 struct header_depend {
  43         struct header *header;
  44         struct header_depend *next;
  45 };
  46
  47 struct header *headerlist = NULL;
  48
  49 static int
  50 depend_add(struct header *from, struct header *to)
  51 {
  52         struct header_depend *hd, *hdp, *hdn;
  53
  54         /* We can't depend on ourself. Prevent duplicates. */
  55         if (from == to)
  56                 return (-1);
  57         for (hd = to->depends; hd != NULL; hd = hd->next) {
  58                 if (hd->header == from)
  59                         return (-1);
  60         }
  61
  62         /* Add item itself */
  63         hd = malloc(sizeof(struct header_depend));
  64         hd->header = from;
  65
  66         hdp = to->depends;
  67         if (hdp == NULL || strcmp(hd->header->filename,
  68             hdp->header->filename) < 0) {
  69                 /* Add it to the beginning */
  70                 hd->next = hdp;
  71                 to->depends = hd;
  72         } else {
  73                 /* Add it after an existing item */
  74                 for (hdp = to->depends; hdp != NULL; hdp = hdp->next) {
  75                         hdn = hdp->next;
  76                         if (hdn == NULL || strcmp(hd->header->filename,
  77                             hdn->header->filename) < 0) {
  78                                 /* Insert it in between */
  79                                 hd->next = hdp->next;
  80                                 hdp->next = hd;
  81                                 break;
  82                         }
  83                 }
  84         }
  85
  86         return (0);
  87 }
  88
  89 static void
  90 depend_copy(struct header *from, struct header *to)
  91 {
  92         struct header_depend *hd;
  93
  94         if (depend_add(from, to) != 0)
  95                 return;
  96         for (hd = from->depends; hd != NULL; hd = hd->next)
  97                 depend_add(hd->header, to);
  98 }
  99
 100 static struct header *
 101 file_scan(const char *filename)
 102 {
 103         int cmp;
 104         struct header *h, *hp, *hn, *hs;
 105         char fbuf[2048], *eol;
 106         FILE *fp;
 107
 108         if (strcmp(filename, "conftest.c") == 0 ||
 109             strcmp(filename, "stdinc.h") == 0)
 110                 return (NULL);
 111
 112         hp = headerlist;
 113         if (hp != NULL) {
 114                 cmp = strcmp(filename, hp->filename);
 115                 if (cmp == 0) {
 116                         return (hp);
 117                 } else if (cmp < 0) {
 118                         /* Item cannot be in the list - add to beginning */
 119                         hp = NULL;
 120                 } else {
 121                         /* Item may be in the list - look it up */
 122                         for (hp = headerlist; hp != NULL; hp = hp->next) {
 123                                 hn = hp->next;
 124                                 if (hn == NULL)
 125                                         break;
 126                                 cmp = strcmp(filename, hn->filename);
 127                                 if (cmp == 0)
 128                                         /* We've found it */
 129                                         return (hn);
 130                                 else if (cmp < 0)
 131                                         /* Add in between */
 132                                         break;
 133                         }
 134                 }
 135         }
 136
 137         fp = fopen(filename, "r");
 138         if (fp == NULL) {
 139                 fprintf(stderr, "Failed to open %s\n", filename);
 140                 return (NULL);
 141         }
 142
 143         /* We can read it - we must track it */
 144         h = malloc(sizeof(struct header));
 145         h->filename = strdup(filename);
 146         h->depends = NULL;
 147         h->next = NULL;
 148
 149         /* Add it alphabetically to the list */
 150         if (hp == NULL) {
 151                 h->next = headerlist;
 152                 headerlist = h;
 153         } else {
 154                 h->next = hp->next;
 155                 hp->next = h;
 156         }
 157
 158         /* Scan the file */
 159         while (fgets(fbuf, sizeof fbuf, fp) != NULL) {
 160                 if (strncmp(fbuf, "#include \"", 10) == 0) {
 161                         eol = strchr(fbuf + 10, '"');
 162                         if (eol == NULL)
 163                                 continue;
 164                         *eol = '\0';
 165
 166                         hs = file_scan(fbuf + 10);
 167                         if (hs != NULL)
 168                                 depend_copy(hs, h);
 169                 }
 170         }
 171
 172         return (h);
 173 }
 174
 175 int
 176 main(int argc, char *argv[])
 177 {
 178         int first;
 179         char *ext;
 180         DIR *srcdir;
 181         FILE *out;
 182         struct dirent *fent;
 183         struct header *h;
 184         struct header_depend *hd;
 185
 186         srcdir = opendir(".");
 187         if (srcdir == NULL) {
 188                 fprintf(stderr, "Failed to open current directory\n");
 189                 return (1);
 190         }
 191
 192         while ((fent = readdir(srcdir)) != NULL) {
 193                 /* Only scan C source code */
 194                 ext = strchr(fent->d_name, '.');
 195                 if (ext == NULL || strcmp(ext, ".c") != 0)
 196                         continue;
 197                 file_scan(fent->d_name);
 198         }
 199         closedir(srcdir);
 200
 201         out = fopen("../depends", "w");
 202         if (out == NULL) {
 203                 fprintf(stderr, "Failed to open output file\n");
 204                 return (1);
 205         }
 206
 207         for (h = headerlist; h != NULL; h = h->next) {
 208                 /* Only print C source code - skip conftest */
 209                 ext = strchr(h->filename, '.');
 210                 if (ext == NULL || strcmp(ext, ".c") != 0)
 211                         continue;
 212                 fprintf(out, "DEPENDS_");
 213                 fwrite(h->filename, 1, ext - h->filename, out);
 214                 fprintf(out, "=\"");
 215                 first = 1;
 216                 for (hd = h->depends; hd != NULL; hd = hd->next) {
 217                         /* Only print header files */
 218                         ext = strchr(hd->header->filename, '.');
 219                         if (ext == NULL || strcmp(ext, ".h") != 0)
 220                                 continue;
 221                         if (first)
 222                                 first = 0;
 223                         else
 224                                 fprintf(out, " ");
 225                         fwrite(hd->header->filename, 1,
 226                             ext - hd->header->filename, out);
 227                 }
 228                 fprintf(out, "\"\n");
 229
 230 #if 0
 231                 /* Regular Makefile-style output */
 232                 ext = strchr(h->filename, '.');
 233                 if (ext == NULL || strcmp(ext, ".c") != 0)
 234                         continue;
 235                 fwrite(h->filename, 1, ext - h->filename, out);
 236                 fprintf(out, ".o: %s", h->filename);
 237                 for (hd = h->depends; hd != NULL; hd = hd->next)
 238                         fprintf(out, " %s", hd->header->filename);
 239                 fprintf(out, "\n");
 240 #endif
 241         }
 242         fclose(out);
 243
 244         return (0);
 245 }