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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 = strstr(map, argv[1]);
int a = 1;
if (argc > 2)
a = atoi(argv[2]);
if (!argv[1][0] || !s) {
// default to first line
s = map;
} else {
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++;
}
}
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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