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