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/*
* UNG's Not GNU
*
* Copyright (c) 2011, Jakob Kaivo <jakob@kaivo.net>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*
*/
#define _POSIX_C_SOURCE 200809L
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define K_BYTES 1024
#define M_BYTES 1048576
#define DEFAULT_BASE "x"
#define DEFAULT_SUFFIX_LENGTH 2
#define DEFAULT_LINES 1000
static char *nextsuffix(size_t n, char s[])
{
const char alphabet[] = "abcdefghijklmnopqrstuvwxyz";
if (s[0] == '\0') {
memset(s, alphabet[0], n);
return s;
}
for (size_t i = n - 1; ; i--) {
s[i] = *(strchr(alphabet, s[i]) + 1);
if (s[i] == '\0') {
if (i == 0) {
return NULL;
}
s[i] = alphabet[0];
} else {
break;
}
}
return s;
}
static int
split(const char *in, const char *base, size_t suffixlen, uintmax_t lines, uintmax_t bytes)
{
char oname[FILENAME_MAX] = {0};
char suffix[suffixlen + 2];
FILE *o = NULL;
FILE *f = stdin;
uintmax_t count = 0;
memset(suffix, '\0', suffixlen + 1);
if (in != NULL && strcmp("-", in) != 0) {
f = fopen(in, "r");
}
if (f == NULL) {
perror("fopen");
return 1;
}
if (in != NULL && base == NULL) {
base = DEFAULT_BASE;
}
int c;
while ((c = fgetc(f)) != EOF) {
if (o == NULL) {
char *s = nextsuffix(suffixlen, suffix);
if (s == NULL) {
fprintf(stderr, "too many chunks\n");
return 1;
}
snprintf(oname, sizeof(oname), "%s%s", base, s);
o = fopen(oname, "w");
if (o == NULL) {
perror("fopen");
return 1;
}
}
fputc(c, o);
if (bytes != 0 || c == '\n') {
count++;
}
if ((bytes != 0 && count == bytes) || count == lines) {
fclose(o);
o = NULL;
count = 0;
}
}
return 0;
}
int main(int argc, char **argv)
{
uintmax_t lines = 0;
uintmax_t bytes = 0;
size_t suffix = DEFAULT_SUFFIX_LENGTH;
char *end;
int c;
while ((c = getopt(argc, argv, "l:a:b:")) != -1) {
switch (c) {
case 'l': /* line_count */
bytes = 0;
lines = strtoumax(optarg, &end, 10);
if (*end != '\0') {
return 1;
}
break;
case 'a': /* suffix_length */
suffix = strtoul(optarg, &end, 10);
if (end != NULL && strlen(end) > 0) {
return 1;
}
break;
case 'b': /* bytes */
lines = 0;
bytes = strtoumax(optarg, &end, 10);
if (*end != '\0') {
if (!strcmp("k", end)) {
bytes *= K_BYTES;
} else if (!strcmp("m", end)) {
bytes *= M_BYTES;
} else {
return 1;
}
}
break;
default:
return 1;
}
}
if (lines == 0 && bytes == 0) {
lines = DEFAULT_LINES;
}
if (optind >= argc) {
split(NULL, NULL, suffix, lines, bytes);
} else if (optind == argc - 1) {
split(argv[optind], NULL, suffix, lines, bytes);
} else if (optind == argc - 2) {
split(argv[optind], argv[optind + 1], suffix, lines, bytes);
} else {
return 1;
}
return 0;
}
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