sbase/split.c

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C
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/* See LICENSE file for copyright and license details. */
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <ctype.h>
#include <limits.h>
#include "util.h"
static int itostr(char *, int, int);
static FILE *nextfile(FILE *, char *, int, int);
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static void
usage(void)
{
eprintf("usage: split [-d] [-a len] [-b [bytes[k|m|g]]] [-l [lines]] [input [prefix]]\n");
}
static int base = 26, start = 'a';
int
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main(int argc, char *argv[])
{
int plen, slen = 2;
int ch;
char name[NAME_MAX+1];
char *prefix = "x";
char *file = NULL;
char *tmp, *end;
uint64_t size = 1000, scale = 1, n;
int always = 0;
FILE *in = stdin, *out = NULL;
ARGBEGIN {
case 'b':
always = 1;
tmp = ARGF();
if(tmp == NULL)
break;
size = strtoull(tmp, &end, 10);
if(*end == '\0')
break;
switch(toupper((int)*end)) {
case 'K':
scale = 1024;
break;
case 'M':
scale = 1024L * 1024L;
break;
case 'G':
scale = 1024L * 1024L * 1024L;
break;
default:
usage();
}
if(size > (UINT64_MAX/scale))
eprintf("'%s': out of range\n", tmp);
size *= scale;
break;
case 'l':
always = 0;
tmp = ARGF();
if(tmp)
size = estrtol(tmp, 10);
break;
case 'a':
slen = estrtol(EARGF(usage()), 10);
break;
case 'd':
base = 10;
start = '0';
break;
default:
usage();
} ARGEND;
if(*argv)
file = *argv++;
if(*argv)
prefix = *argv++;
if(*argv)
usage();
plen = strlen(prefix);
if(plen+slen > NAME_MAX)
eprintf("names cannot exceed %d bytes\n", NAME_MAX);
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strlcpy(name, prefix, sizeof(name));
if(file && strcmp(file, "-") != 0) {
in = fopen(file, "r");
if(!in)
eprintf("'%s':", file);
}
Nextfile:
while((out = nextfile(out, name, plen, slen))) {
n = 0;
while((ch = getc(in)) != EOF) {
putc(ch, out);
n += (always || ch == '\n');
if(n >= size)
goto Nextfile;
}
fclose(out);
break;
}
return EXIT_SUCCESS;
}
int
itostr(char *str, int x, int n)
{
str[n] = '\0';
while(n-- > 0) {
str[n] = start + (x % base);
x /= base;
}
if(x)
return -1;
return 0;
}
FILE *
nextfile(FILE *f, char *buf, int plen, int slen)
{
static int n = 0;
int s;
if(f)
fclose(f);
s = itostr(buf+plen, n++, slen);
if(s == -1)
return NULL;
f = fopen(buf, "w");
if(!f)
eprintf("'%s':", buf);
return f;
}