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BSD 4.3

/* $Header: /var/lib/cvsd/repos/CSRG/43BSD/contrib/mkmf/src/mustfopen.c,v 1.1.1.1 2018/04/24 16:12:54 root Exp $ */

/*
 * Author: Peter J. Nicklin
 */

/*
 * mustfopen() opens a file in the manner of fopen(3). However, if the file
 * cannot be accessed, exit(1) is called.
 */
#include <stdio.h>

extern char *PGN;		/* program name */

FILE *
mustfopen(filename,mode)
	char *filename;
	char *mode;
{
	FILE *stream;			/* file stream */

	if ((stream = fopen(filename,mode)) == NULL)
		{
		if (*PGN != '\0')
			fprintf(stderr, "%s: ", PGN);
		fprintf(stderr, "can't open %s\n",filename);
		exit(1);
		}
	return(stream);
}

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