usr.bin/mkstr/mkstr.c

   1 /*
   2  * Copyright (c) 1980, 1993
   3  *      The Regents of the University of California.  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  * 3. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)mkstr.c  8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/mkstr/mkstr.c,v 1.4.2.1 2002/11/16 01:07:42 tjr Exp $
  32  */
  33
  34 #include <err.h>
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #define ungetchar(c)    ungetc(c, stdin)
  41
  42 /*
  43  * mkstr - create a string error message file by massaging C source
  44  *
  45  * Bill Joy UCB August 1977
  46  *
  47  * Modified March 1978 to hash old messages to be able to recompile
  48  * without addding messages to the message file (usually)
  49  *
  50  * Based on an earlier program conceived by Bill Joy and Chuck Haley
  51  *
  52  * Program to create a string error message file
  53  * from a group of C programs.  Arguments are the name
  54  * of the file where the strings are to be placed, the
  55  * prefix of the new files where the processed source text
  56  * is to be placed, and the files to be processed.
  57  *
  58  * The program looks for 'error("' in the source stream.
  59  * Whenever it finds this, the following characters from the '"'
  60  * to a '"' are replaced by 'seekpt' where seekpt is a
  61  * pointer into the error message file.
  62  * If the '(' is not immediately followed by a '"' no change occurs.
  63  *
  64  * The optional '-' causes strings to be added at the end of the
  65  * existing error message file for recompilation of single routines.
  66  */
  67
  68 static FILE     *mesgread, *mesgwrite;
  69 static char     name[100], *np;
  70
  71 static void copystr(void);
  72 static int fgetNUL(char *, int, FILE *);
  73 static unsigned hashit(char *, int, unsigned);
  74 static void inithash(void);
  75 static int match(const char *);
  76 static int octdigit(char);
  77 static void process(void);
  78 static void usage(void) __dead2;
  79
  80 int
  81 main(int argc, char *argv[])
  82 {
  83         char addon = 0;
  84         size_t namelen;
  85
  86         argc--, argv++;
  87         if (argc > 1 && argv[0][0] == '-')
  88                 addon++, argc--, argv++;
  89         if (argc < 3)
  90                 usage();
  91         mesgwrite = fopen(argv[0], addon ? "a" : "w");
  92         if (mesgwrite == NULL)
  93                 err(1, "%s", argv[0]);
  94         mesgread = fopen(argv[0], "r");
  95         if (mesgread == NULL)
  96                 err(1, "%s", argv[0]);
  97         inithash();
  98         argc--, argv++;
  99         namelen = strlcpy(name, argv[0], sizeof(name));
 100         if (namelen >= sizeof(name)) {
 101                 errno = ENAMETOOLONG;
 102                 err(1, "%s", argv[0]);
 103         }
 104         np = name + namelen;
 105         argc--, argv++;
 106         do {
 107                 if (strlcpy(np, argv[0], sizeof(name) - namelen) >=
 108                     sizeof(name) - namelen) {
 109                         errno = ENAMETOOLONG;
 110                         err(1, "%s%s", name, argv[0]);
 111                 }
 112                 if (freopen(name, "w", stdout) == NULL)
 113                         err(1, "%s", name);
 114                 if (freopen(argv[0], "r", stdin) == NULL)
 115                         err(1, "%s", argv[0]);
 116                 process();
 117                 argc--, argv++;
 118         } while (argc > 0);
 119         exit(0);
 120 }
 121
 122 static void
 123 usage(void)
 124 {
 125         fprintf(stderr, "usage: mkstr [-] mesgfile prefix file ...\n");
 126         exit(1);
 127 }
 128
 129 static void
 130 process(void)
 131 {
 132         int c;
 133
 134         for (;;) {
 135                 c = getchar();
 136                 if (c == EOF)
 137                         return;
 138                 if (c != 'e') {
 139                         putchar(c);
 140                         continue;
 141                 }
 142                 if (match("error(")) {
 143                         printf("error(");
 144                         c = getchar();
 145                         if (c != '"')
 146                                 putchar(c);
 147                         else
 148                                 copystr();
 149                 }
 150         }
 151 }
 152
 153 static int
 154 match(const char *ocp)
 155 {
 156         const char *cp;
 157         int c;
 158
 159         for (cp = ocp + 1; *cp; cp++) {
 160                 c = getchar();
 161                 if (c != *cp) {
 162                         while (ocp < cp)
 163                                 putchar(*ocp++);
 164                         ungetchar(c);
 165                         return (0);
 166                 }
 167         }
 168         return (1);
 169 }
 170
 171 static void
 172 copystr(void)
 173 {
 174         int c, ch;
 175         char buf[512];
 176         char *cp = buf;
 177
 178         for (;;) {
 179                 if (cp == buf + sizeof(buf) - 2)
 180                         errx(1, "message too long");
 181                 c = getchar();
 182                 if (c == EOF)
 183                         break;
 184                 switch (c) {
 185
 186                 case '"':
 187                         *cp++ = 0;
 188                         goto out;
 189                 case '\\':
 190                         c = getchar();
 191                         switch (c) {
 192
 193                         case 'b':
 194                                 c = '\b';
 195                                 break;
 196                         case 't':
 197                                 c = '\t';
 198                                 break;
 199                         case 'r':
 200                                 c = '\r';
 201                                 break;
 202                         case 'n':
 203                                 c = '\n';
 204                                 break;
 205                         case '\n':
 206                                 continue;
 207                         case 'f':
 208                                 c = '\f';
 209                                 break;
 210                         case '0':
 211                                 c = 0;
 212                                 break;
 213                         case '\\':
 214                                 break;
 215                         default:
 216                                 if (!octdigit(c))
 217                                         break;
 218                                 c -= '0';
 219                                 ch = getchar();
 220                                 if (!octdigit(ch))
 221                                         break;
 222                                 c <<= 7, c += ch - '0';
 223                                 ch = getchar();
 224                                 if (!octdigit(ch))
 225                                         break;
 226                                 c <<= 3, c+= ch - '0', ch = -1;
 227                                 break;
 228                         }
 229                 }
 230                 *cp++ = c;
 231         }
 232 out:
 233         *cp = 0;
 234         printf("%d", hashit(buf, 1, 0));
 235 }
 236
 237 static int
 238 octdigit(char c)
 239 {
 240
 241         return (c >= '0' && c <= '7');
 242 }
 243
 244 static void
 245 inithash(void)
 246 {
 247         char buf[512];
 248         int mesgpt = 0;
 249
 250         rewind(mesgread);
 251         while (fgetNUL(buf, sizeof buf, mesgread) != 0) {
 252                 hashit(buf, 0, mesgpt);
 253                 mesgpt += strlen(buf) + 2;
 254         }
 255 }
 256
 257 #define NBUCKETS        511
 258
 259 static struct   hash {
 260         long    hval;
 261         unsigned hpt;
 262         struct  hash *hnext;
 263 } *bucket[NBUCKETS];
 264
 265 static unsigned
 266 hashit(char *str, int really, unsigned fakept)
 267 {
 268         int i;
 269         struct hash *hp;
 270         char buf[512];
 271         long hashval = 0;
 272         char *cp;
 273
 274         if (really)
 275                 fflush(mesgwrite);
 276         for (cp = str; *cp;)
 277                 hashval = (hashval << 1) + *cp++;
 278         i = hashval % NBUCKETS;
 279         if (i < 0)
 280                 i += NBUCKETS;
 281         if (really != 0)
 282                 for (hp = bucket[i]; hp != NULL; hp = hp->hnext)
 283                 if (hp->hval == hashval) {
 284                         fseek(mesgread, (long) hp->hpt, 0);
 285                         fgetNUL(buf, sizeof buf, mesgread);
 286 /*
 287                         fprintf(stderr, "Got (from %d) %s\n", hp->hpt, buf);
 288 */
 289                         if (strcmp(buf, str) == 0)
 290                                 break;
 291                 }
 292         if (!really || hp == NULL) {
 293                 hp = (struct hash *) calloc(1, sizeof *hp);
 294                 if (hp == NULL)
 295                         err(1, NULL);
 296                 hp->hnext = bucket[i];
 297                 hp->hval = hashval;
 298                 hp->hpt = really ? ftell(mesgwrite) : fakept;
 299                 if (really) {
 300                         fwrite(str, sizeof (char), strlen(str) + 1, mesgwrite);
 301                         fwrite("\n", sizeof (char), 1, mesgwrite);
 302                 }
 303                 bucket[i] = hp;
 304         }
 305 /*
 306         fprintf(stderr, "%s hashed to %ld at %d\n", str, hp->hval, hp->hpt);
 307 */
 308         return (hp->hpt);
 309 }
 310
 311 static int
 312 fgetNUL(char *obuf, int rmdr, FILE *file)
 313 {
 314         int c;
 315         char *buf = obuf;
 316
 317         while (--rmdr > 0 && (c = getc(file)) != 0 && c != EOF)
 318                 *buf++ = c;
 319         *buf++ = 0;
 320         getc(file);
 321         return ((feof(file) || ferror(file)) ? 0 : 1);
 322 }