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Annotation of 42BSD/usr.bin/uucp/cfgets.c, revision 1.1.1.1

1.1       root        1: #ifndef lint
                      2: static char sccsid[] = "@(#)cfgets.c   5.1 (Berkeley) 7/2/83";
                      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: char *
                     16: cfgets (buf, siz, fil)
                     17: register char *buf;
                     18: int siz;
                     19: FILE *fil;
                     20: {
                     21:        register char *s;
                     22:        register i, c, len;
                     23:        char *fgets();
                     24: 
                     25:        for (i=0,s=buf; i = (fgets (s, siz-i, fil) != NULL); i = s - buf) {
                     26: 
                     27:                /* get last character of line */
                     28:                c = s[len = (strlen (s) - 1)];
                     29: 
                     30:                /* skip comments; make sure end of comment line seen */
                     31:                if (*s == COMMENT) {
                     32:                        while (c != EOLN && c != EOF)
                     33:                                c = fgetc (fil);
                     34:                        *s = EOS;
                     35:                }
                     36: 
                     37:                /* skip blank lines */
                     38:                else if (*s != EOLN) {
                     39:                        s += len;
                     40: 
                     41:                        /* continue lines ending with CONTINUE */
                     42:                        if (c != EOLN || *--s != CONTINUE)
                     43:                                break;
                     44:                }
                     45:        }
                     46:        
                     47:        return (i ? buf : NULL);
                     48: }
                     49: 
                     50: #ifdef TEST
                     51: main()
                     52: {
                     53:        char buf[512];
                     54: 
                     55:        while (cfgets (buf, sizeof buf, stdin))
                     56:                fputs (buf, stdout);
                     57: }
                     58: #endif TEST

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