4.3BSD - /usr/src/usr.bin/uucp/cfgets.c

   1: #ifndef lint
   2: static char sccsid[] = "@(#)cfgets.c	5.3 (Berkeley) 6/19/85";
   3: #endif
   4: 
   5: /*
   6:  * get nonblank, non-comment, (possibly continued) line. Alan S. Watt
   7:  */
   8: 
   9: #include <stdio.h>
  10: #define COMMENT     '#'
  11: #define CONTINUE    '\\'
  12: #define EOLN        '\n'
  13: #define EOS     '\0'
  14: 
  15: /*LINTLIBRARY*/
  16: 
  17: char *
  18: cfgets(buf, siz, fil)
  19: register char *buf;
  20: int siz;
  21: FILE *fil;
  22: {
  23:     register char *s;
  24:     register i, c, len;
  25:     char *fgets();
  26: 
  27:     for (i=0,s=buf; i = (fgets(s, siz-i, fil) != NULL); i = s - buf) {
  28: 
  29:         /* get last character of line */
  30:         c = s[len = (strlen(s) - 1)];
  31: 
  32:         /* skip comments; make sure end of comment line seen */
  33:         if (*s == COMMENT) {
  34:             while (c != EOLN && c != EOF)
  35:                 c = getc(fil);
  36:             *s = EOS;
  37:         }
  38: 
  39:         /* skip blank lines */
  40:         else if (*s != EOLN) {
  41:             s += len;
  42: 
  43:             /* continue lines ending with CONTINUE */
  44:             if (c != EOLN || *--s != CONTINUE)
  45:                 break;
  46:         }
  47:     }
  48: 
  49:     return i ? buf : NULL;
  50: }
  51: 
  52: #ifdef TEST
  53: main()
  54: {
  55:     char buf[512];
  56: 
  57:     while (cfgets(buf, sizeof buf, stdin))
  58:         fputs(buf, stdout);
  59: }
  60: #endif TEST

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Defined macros