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/* ISC license. */
#include <errno.h>
#include <stdlib.h>
#include <skalibs/sgetopt.h>
#include <skalibs/bytestr.h>
#include <skalibs/types.h>
#include <skalibs/disize.h>
#include <skalibs/buffer.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/genalloc.h>
#include <skalibs/djbunix.h>
#include <skalibs/skamisc.h>
#define USAGE "s6-cut [ -b list | -c list | -f list ] [ -d delim ] [ -n ] [ -s ] [ file... ]"
static int disize_cmpleft (void const *a, void const *b)
{
return ((disize const *)a)->left - ((disize const *)b)->left ;
}
static void disizealloc_normalize (genalloc *list)
{
size_t i = 1, cur = 0 ;
size_t len = genalloc_len(disize, list) ;
disize *const s = genalloc_s(disize, list) ;
qsort(s, len, sizeof(disize), &disize_cmpleft) ;
for (; i < len ; i++)
if (!s[cur].right) break ;
else if (s[i].left > s[cur].right) s[++cur] = s[i] ;
else if (s[cur].right < s[i].right)
s[cur].right = s[i].right ;
genalloc_setlen(disize, list, cur+1) ;
}
static void scanlist (genalloc *list, char const *s)
{
size_t i = 0 ;
genalloc_setlen(disize, list, 0) ;
while (s[i])
{
char const sep[4] = ", \t" ;
disize iv ;
if (s[i] == '-') iv.left = 1 ;
else
{
size_t j = size_scan(s+i, &iv.left) ;
if (!j || !iv.left) strerr_dief2x(100, "invalid list argument: ", s) ;
i += j ;
}
if (s[i] != '-') iv.right = iv.left ;
else
{
size_t j = size_scan(s + ++i, &iv.right) ;
if (!j) iv.right = 0 ;
else if (iv.right < iv.left)
strerr_dief2x(100, "invalid list argument: ", s) ;
else i += j ;
}
switch (byte_chr(sep, 4, s[i]))
{
case 0 :
case 1 :
case 2 : i++ ;
case 3 : break ;
case 4 :
strerr_dief2x(100, "invalid list argument: ", s) ;
}
if (!genalloc_append(disize, list, &iv))
strerr_diefu1sys(111, "build interval list") ;
}
}
static int doit (int fd, disize const *s, size_t len, unsigned int flags, char delim)
{
char buf[BUFFER_INSIZE] ;
buffer b = BUFFER_INIT(&buffer_flush1read, fd, buf, BUFFER_INSIZE) ;
for (;;)
{
int r ;
satmp.len = 0 ;
r = skagetln(&b, &satmp, '\n') ;
if ((r == -1) && (errno != EPIPE)) return 0 ;
if (!r) break ;
if (flags & 2)
{
size_t i = 0 ;
for (; i < len ; i++)
{
size_t j = s[i].right ;
if (s[i].left >= satmp.len) break ;
if (!j || (j > satmp.len))
{
j = satmp.len ;
r = 0 ;
}
if (buffer_put(buffer_1, satmp.s + s[i].left - 1, j + 1 - s[i].left) == -1)
return 0 ;
}
}
else
{
size_t i = 0, j = 0, count = 1 ;
for (; i < len ; i++)
{
for (; count < s[i].left ; count++)
{
j += byte_chr(satmp.s + j, satmp.len - j, delim) ;
if (j == satmp.len) break ;
j++ ;
}
if (j == satmp.len)
{
if (count == 1)
{
if ((flags & 1) && (buffer_put(buffer_1, satmp.s, satmp.len) < 0))
return 0 ;
r = 0 ;
}
break ;
}
for (; !s[i].right || (count <= s[i].right) ; count++)
{
size_t k = byte_chr(satmp.s + j, satmp.len - j, delim) ;
if ((count > s[0].left) && (buffer_put(buffer_1, &delim, 1) < 0)) return 0 ;
if (buffer_put(buffer_1, satmp.s + j, k) < 0) return 0 ;
j += k ;
if (j == satmp.len)
{
r = 0 ;
break ;
}
j++ ;
}
if (j == satmp.len) break ;
}
}
if ((r > 0) && (buffer_put(buffer_1, "\n", 1) < 0)) return 0 ;
}
return 1 ;
}
int main (int argc, char const *const *argv)
{
genalloc list = GENALLOC_ZERO ; /* array of disize */
char delim = '\t' ;
unsigned int what = 0 ;
PROG = "s6-cut" ;
{
subgetopt l = SUBGETOPT_ZERO ;
int flagnodel = 1 ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "nsb:c:f:d:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'n': break ; /* ignored */
case 's': flagnodel = 0 ; break ;
case 'd': delim = *l.arg ; break ;
case 'b':
case 'c':
{
if (what) strerr_dieusage(100, USAGE) ;
what = 2 ;
scanlist(&list, l.arg) ;
break ;
}
case 'f':
{
if (what) strerr_dieusage(100, USAGE) ;
what = 4 ;
scanlist(&list, l.arg) ;
break ;
}
default : strerr_dieusage(100, USAGE) ;
}
}
what += flagnodel ;
argc -= l.ind ; argv += l.ind ;
}
if (!genalloc_len(disize, &list)) strerr_dieusage(100, USAGE) ;
disizealloc_normalize(&list) ;
if (!argc)
{
if (!doit(0, genalloc_s(disize, &list), genalloc_len(disize, &list), what, delim))
strerr_diefu1sys(111, "cut stdin") ;
}
else
{
for (; *argv ; argv++)
{
if ((argv[0][0] == '-') && !argv[0][1])
{
if (!doit(0, genalloc_s(disize, &list), genalloc_len(disize, &list), what, delim))
strerr_diefu1sys(111, "process stdin") ;
}
else
{
int fd = open_readb(*argv) ;
if (fd == -1)
strerr_diefu3sys(111, "open ", *argv, " for reading") ;
if (!doit(fd, genalloc_s(disize, &list), genalloc_len(disize, &list), what, delim))
strerr_diefu2sys(111, "cut ", *argv) ;
fd_close(fd) ;
}
}
}
return 0 ;
}
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