118 lines
2.3 KiB
C
118 lines
2.3 KiB
C
/* split - split a file Author: Michiel Huisjes */
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#include <sys/types.h>
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#include <fcntl.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <minix/minlib.h>
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#define CHUNK_SIZE 1024
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int cut_line = 1000;
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int infile;
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char out_file[100];
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char *suffix;
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_PROTOTYPE(int main, (int argc, char **argv));
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_PROTOTYPE(void split, (void));
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_PROTOTYPE(int newfile, (void));
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_PROTOTYPE(void usage, (void));
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_PROTOTYPE(void quit, (void));
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int main(argc, argv)
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int argc;
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char **argv;
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{
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unsigned short i;
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out_file[0] = 'x';
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infile = -1;
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if (argc > 4) usage();
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for (i = 1; i < argc; i++) {
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if (argv[i][0] == '-') {
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if (argv[i][1] >= '0' && argv[i][1] <= '9'
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&& cut_line == 1000)
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cut_line = atoi(argv[i]);
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else if (argv[i][1] == '\0' && infile == -1)
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infile = 0;
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else
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usage();
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} else if (infile == -1) {
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if ((infile = open(argv[i], O_RDONLY)) < 0) {
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std_err("Cannot open input file.\n");
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exit(1);
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}
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} else
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strcpy(out_file, argv[i]);
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}
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if (infile == -1) infile = 0;
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strcat(out_file, "aa");
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for (suffix = out_file; *suffix; suffix++);
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suffix--;
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/* Appendix now points to last `a' of "aa". We have to decrement it by one */
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*suffix = 'a' - 1;
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split();
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return(0);
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}
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void split()
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{
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char buf[CHUNK_SIZE];
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register char *index, *base;
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register int n;
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int fd;
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long lines = 0L;
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fd = -1;
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while ((n = read(infile, buf, CHUNK_SIZE)) > 0) {
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base = index = buf;
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while (--n >= 0) {
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if (*index++ == '\n')
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if (++lines % cut_line == 0) {
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if (fd == -1) fd = newfile();
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if (write(fd, base, (int) (index - base)) != (int) (index - base))
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quit();
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base = index;
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close(fd);
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fd = -1;
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}
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}
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if (index == base) continue;
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if (fd == -1) fd = newfile();
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if (write(fd, base, (int) (index - base)) != (int) (index - base))
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quit();
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}
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}
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int newfile()
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{
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int fd;
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if (++*suffix > 'z') { /* Increment letter */
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*suffix = 'a'; /* Reset last letter */
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++*(suffix - 1); /* Previous letter must be incremented */
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/* E.g. was `filename.az' */
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/* Now `filename.ba' */
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}
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if ((fd = creat(out_file, 0644)) < 0) {
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std_err("Cannot create new file.\n");
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exit(2);
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}
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return fd;
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}
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void usage()
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{
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std_err("Usage: split [-n] [file [name]].\n");
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exit(1);
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}
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void quit()
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{
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std_err("split: write error\n");
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exit(1);
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}
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