formatparse.c

#include <err.h>
#include <fcntl.h>
#include <malloc.h>
#include <stdio.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>

#include <sys/mman.h>
#include <sys/stat.h>

char *
load_file(const char *filename, char *buf, ssize_t nr)
{
	int fd;
	ssize_t n;

	if (nr <= 0)
		errx(1, "bad nr");
	if ((fd = open(filename, O_RDONLY)) == -1)
		err(1, "open");
	bzero(buf, nr);
	n = read(fd, buf, nr - 1);
	printf("nr=%zd n=%zd\n", nr, n);
	if (n == -1)
		err(1, "read");
	else if (n == 0)
		errx(1, "read EOF");
	close(fd);

	return (buf);
}

int
main(int argc, char *argv[])
{
	char *filename, *start, *s, *send;
	char buf[4096];

	if (argc != 2)
		errx(1, "%s: filename", argv[0]);
	filename = argv[1];
	start = load_file(filename, buf, sizeof(buf));
	s = strstr(start, "\n\n");
	if (s == NULL)
		errx(1, "s1 not found");
	s = strstr(s, ";\toffset:");
	if (s == NULL)
		errx(1, "s2 not found");
	s += strlen(";\toffset:");
	send = strchr(s, ';');
	printf("s[0]=%c s[1]=%c (end - start) = %zd\n", s[0], s[1], send - s);
	

	return (0);
}