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[unix-history] / usr / src / usr.bin / uucp / libuu / cfgets.c

#ifndef lint
static char sccsid[] = "@(#)cfgets.c    5.3 (Berkeley) %G%";
#endif

/*
* get nonblank, non-comment, (possibly continued) line. Alan S. Watt 
*/

#include <stdio.h>
#define COMMENT         '#'
#define CONTINUE        '\\'
#define EOLN            '\n'
#define EOS             '\0'

/*LINTLIBRARY*/

char *
cfgets(buf, siz, fil)
register char *buf;
int siz;
FILE *fil;
{
       register char *s;
       register i, c, len;
       char *fgets();

       for (i=0,s=buf; i = (fgets(s, siz-i, fil) != NULL); i = s - buf) {

               /* get last character of line */
               c = s[len = (strlen(s) - 1)];

               /* skip comments; make sure end of comment line seen */
               if (*s == COMMENT) {
                       while (c != EOLN && c != EOF)
                               c = getc(fil);
                       *s = EOS;
               }

               /* skip blank lines */
               else if (*s != EOLN) {
                       s += len;

                       /* continue lines ending with CONTINUE */
                       if (c != EOLN || *--s != CONTINUE)
                               break;
               }
       }
       
       return i ? buf : NULL;
}

#ifdef TEST
main()
{
       char buf[512];

       while (cfgets(buf, sizeof buf, stdin))
               fputs(buf, stdout);
}
#endif TEST