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/* ISC license. */
#include <errno.h>
#include <regex.h>
#include <string.h>
#include <skalibs/bytestr.h>
#include <skalibs/sgetopt.h>
#include <skalibs/buffer.h>
#include <skalibs/uint.h>
#include <skalibs/strerr2.h>
#include <skalibs/stralloc.h>
#include <skalibs/skamisc.h>
#define USAGE "s6-grep [ -E | -F ] [ -i ] [ -c ] [ -n ] [ -q ] [ -v ] pattern"
typedef struct flags_s flags_t, *flags_t_ref ;
struct flags_s
{
unsigned int extended : 1 ;
unsigned int ignorecase: 1 ;
unsigned int fixed : 1 ;
unsigned int count : 1 ;
unsigned int num : 1 ;
unsigned int quiet : 1 ;
unsigned int not : 1 ;
} ;
#define FLAGS_ZERO { .extended = 0, .ignorecase = 0, .fixed = 0, .count = 0, .num = 0, .quiet = 0, .not = 0 }
int main (int argc, char const *const *argv)
{
unsigned int count = 0 ;
flags_t flags = FLAGS_ZERO ;
PROG = "s6-grep" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
register int opt = subgetopt_r(argc, argv, "EFicnqv", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'E': flags.extended = 1 ; break ;
case 'F': flags.fixed = 1 ; break ;
case 'i': flags.ignorecase = 1 ; break ;
case 'c': flags.count = 1 ; break ;
case 'n': flags.num = 1 ; break ;
case 'q': flags.quiet = 1 ; break ;
case 'v': flags.not = 1 ; break ;
default : strerr_dieusage(100, USAGE) ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) strerr_dieusage(100, USAGE) ;
{
stralloc line = STRALLOC_ZERO ;
regex_t re ;
unsigned int num = 0 ;
unsigned int arglen ;
if (flags.fixed)
{
if (flags.ignorecase) arglen = str_len(argv[0]) ;
}
else
{
register int e = regcomp(&re, argv[0], REG_NOSUB | (flags.extended ? REG_EXTENDED : 0) | (flags.ignorecase ? REG_ICASE : 0)) ;
if (e)
{
char buf[256] ;
regerror(e, &re, buf, 256) ;
strerr_diefu2x(111, "compile regular expression: ", buf) ;
}
}
for (;;)
{
register int r ;
line.len = 0 ;
r = skagetln(buffer_0f1, &line, '\n') ;
if (!r) break ;
if (r < 0)
{
if ((errno != EPIPE) || !stralloc_catb(&line, "\n", 1))
strerr_diefu1sys(111, "read from stdin") ;
}
num++ ; line.s[line.len-1] = 0 ;
if (flags.fixed)
{
if (flags.ignorecase)
r = case_str(line.s, argv[0]) >= arglen ;
else
r = !strstr(line.s, argv[0]) ;
}
else
{
r = regexec(&re, line.s, 0, 0, 0) ;
if (r && r != REG_NOMATCH)
{
char buf[256] ;
regerror(r, &re, buf, 256) ;
strerr_diefu2x(111, "match regular expression: ", buf) ;
}
}
line.s[line.len-1] = '\n' ;
if (!r ^ flags.not)
{
count++ ;
if (!flags.quiet && !flags.count)
{
if (flags.num)
{
char fmt[UINT_FMT] ;
register unsigned int n = uint_fmt(fmt, num) ;
fmt[n++] = ':' ;
if (buffer_put(buffer_1, fmt, n) < (int)n)
strerr_diefu1sys(111, "write to stdout") ;
}
if (buffer_put(buffer_1, line.s, line.len) < (int)line.len)
strerr_diefu1sys(111, "write to stdout") ;
}
}
}
if (flags.quiet) return !count ;
stralloc_free(&line) ;
if (!flags.fixed) regfree(&re) ;
}
if (flags.count)
{
char fmt[UINT_FMT] ;
register unsigned int n = uint_fmt(fmt, count) ;
fmt[n++] = '\n' ;
if (buffer_put(buffer_1, fmt, n) < (int)n)
strerr_diefu1sys(111, "write to stdout") ;
}
return !count ;
}
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