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    Length: 1540 (0x604)
    Types: TextFile
    Names: »sop.c«

└─⟦a0efdde77⟧ Bits:30001252 EUUGD11 Tape, 1987 Spring Conference Helsinki
    └─⟦this⟧ »EUUGD11/euug-87hel/sec1/sop/sop.c« 

TextFile

/*
 *  SOP - process .so commands
 *  Bill Davidsen - 8/10/86
 *
 *  for those system in which the tbl and eqn processors don't
 *  process .so commands and the included files require pro-
 *  cessing.
 *
 *  Use:
 *   sop firstfile | tbl | nroff ...
 */

#include <stdio.h>
#define LLEN	256		/* longest line to allow */

FILE *stack[10],		/* file stack */
     *fp,			/* current file pointer */
     *fopen ();
int  index = 0;			/* index into file stack */

char  line[LLEN];		/* line buffer */

main (argc, argv)
    int  argc;
    char *argv[];
{
    switch (argc)
    {
    case 1: /* use standard input */
	fp = stdin; /* read standard input */
	break;
    case 2: /* got a file to use */
	fp = fopen (argv[1], "r");
	if (fp == NULL)
	{ /* bad filename */
	    fprintf (stderr, "Can't open file %s\n", argv[1]);
	    exit (1);
	}
	break;
    default: 
	fprintf (stderr, "Format\n  sop\n  -or-\n  sop filename\n");
	exit (1);
    }

    while (fp != NULL)
    { /* read and scan for .so */
	if (fgets (line, LLEN, fp) == NULL)
	{ /* end of file on current file */
	    if (index)
		fp = stack[--index];
	    else
		fp = NULL;
	    continue;
	}

	if (strncmp (line, ".so ", 4) == 0)
	{ /* include this file */
	    stack[index++] = fp;
	/* set newline to EOL */
	    line[strlen (line) - 1] = 0;
	/* open the next file */
	    fp = fopen (line + 4, "r");
	    if (fp == NULL)
	    { /* bad include file */
		fprintf (stderr, "Can't open include file %s\n", line + 4);
		exit (1);
	    }
	    continue;
	}

	fputs (line, stdout);
    }
}