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#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <unistd.h>
#include <sys/mman.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
int
main(int argc, char *argv[])
{
int fd;
struct stat st;
fd = open("map", O_RDONLY);
if (!fd)
exit(101);
fstat(fd, &st);
char *map = mmap(0, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
if (!map)
exit(102);
char *s;
char *arg;
if (argc > 2)
arg = argv[2];
else
arg = "+1";
if (argc <= 1 || !argv[1][0]) {
// default to first line
arg = "1";
}
if (*arg == '+' || *arg == '-') {
s = strstr(map, argv[1]);
int a = atoi(arg);
if (!s) {
s = map;
a = 0;
}
if (a > 0) {
while (a-- > 0) {
while (*s && *s != '\n')
s++;
s++;
}
} else {
while (a++ <= 0 && map < s) {
s--;
while (map < s && *s != '\n')
s--;
}
if (map < s && *s == '\n')
s++;
}
} else {
int a = atoi(arg);
s = map;
while (--a > 0) {
char *n = strchr(s+1, '\n');
if (!n)
break;
s = n;
}
if (s && *s)
s++;
}
char *t = s;
while (*t && *t != '\n')
t++;
if (!*t)
return 1;
t++;
if (write(1, s, t-s) <= 0)
return 2;
return 0;
}
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