40 lines
1 KiB
C
40 lines
1 KiB
C
#include <stdio.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/mman.h>
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#include <err.h>
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#include <string.h>
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int main()
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{
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struct stat s;
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int fd = open("mlijobs.txt", O_RDONLY);
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int cnt, max_cnt, occur;
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char *buf, *ptr;
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if (fd == -1) err(1, "open");
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fstat(fd, &s);
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ptr = buf = mmap(0, s.st_size, PROT_READ | PROT_WRITE, MAP_PRIVATE, fd, 0);
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cnt = max_cnt = 0;
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while(ptr - buf < s.st_size - 33) {
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if (!strncmp(ptr, "License OUT", 11) && ++cnt >= max_cnt) {
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if (cnt > max_cnt) {
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max_cnt = cnt;
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occur = 0;
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}
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/* can't sprintf time stamp: might overlap */
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memmove(buf + 26 * occur, ptr + 14, 19);
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sprintf(buf + 26 * occur + 19, "%6d\n", cnt);
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occur++;
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} else if (!strncmp(ptr, "License IN ", 11)) cnt --;
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while (ptr < buf + s.st_size && *ptr++ != '\n');
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}
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printf(buf);
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munmap(buf, s.st_size);
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return close(fd);
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}
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