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