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/* vi: set sw=4 ts=4:
*
* split.c
*
* Function that splits a string intro arguments with quoting.
*
* by Nick Patavalis (npat@efault.net)
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "split.h"
/* Lexer error end-codes */
enum err_codes {
ERR_OK = 0, /* no error, string lexed ok */
ERR_BS_AT_EOS, /* backslash at the end of string */
ERR_SQ_OPEN_AT_EOS, /* single-quote left open */
ERR_DQ_OPEN_AT_EOS /* double-quote left open */
};
/* Lexer states */
enum states {
ST_DELIM,
ST_QUOTE,
ST_ARG,
ST_END
};
/* Special characters */
#define BS '\\'
#define SQ '\''
#define DQ '\"'
#define NL '\n'
#define EOS '\0'
#define is_delim(c) \
( (c) == ' ' || (c) == '\t' || (c) == '\n' )
#define is_dq_escapable(c) \
( (c) == '\\' || (c) == '\"' || (c) == '`' || (c) == '$' )
/* Short-hands used in split_quoted() */
#define push() \
do { \
char *arg; \
if ( *argc < argv_sz ) { \
*ap = '\0'; \
arg = strdup(arg_buff); \
/* !! out of mem !! */ \
if ( ! arg ) return -1; \
argv[*argc] = arg; \
(*argc)++; \
} else { \
flags |= SPLIT_DROP; \
} \
ap = &arg_buff[0]; \
} while(0)
#define save() \
do { \
if (ap != ae) { \
*ap++ = *c; \
} else { \
flags |= SPLIT_TRUNC; \
} \
} while (0)
int
split_quoted (const char *s, int *argc, char *argv[], int argv_sz)
{
char arg_buff[MAX_ARG_LEN]; /* current argument buffer */
char *ap, *ae; /* arg_buff current ptr & end-guard */
const char *c; /* current input charcter ptr */
char qc; /* current quote character */
enum states state; /* current state */
enum err_codes err; /* error end-code */
int flags; /* warning flags */
ap = &arg_buff[0];
ae = &arg_buff[MAX_ARG_LEN - 1];
c = &s[0];
state = ST_DELIM;
err = ERR_OK;
flags = 0;
qc = SQ; /* silence compiler waring */
while ( state != ST_END ) {
switch (state) {
case ST_DELIM:
while ( is_delim(*c) ) c++;
if ( *c == SQ || *c == DQ ) {
qc = *c; c++; state = ST_QUOTE;
break;
}
if ( *c == EOS ) {
state = ST_END;
break;
}
if ( *c == BS ) {
c++;
if ( *c == NL ) {
c++;
break;
}
if ( *c == EOS ) {
state = ST_END; err = ERR_BS_AT_EOS;
break;
}
}
/* All other cases incl. character after BS */
save(); c++; state = ST_ARG;
break;
case ST_QUOTE:
while ( *c != qc && ( *c != BS || qc == SQ ) && *c != EOS ) {
save(); c++;
}
if ( *c == qc ) {
c++; state = ST_ARG;
break;
}
if ( *c == BS ) {
assert (qc == DQ);
c++;
if ( *c == NL) {
c++;
break;
}
if (*c == EOS) {
state = ST_END; err = ERR_BS_AT_EOS;
break;
}
if ( ! is_dq_escapable(*c) ) {
c--; save(); c++;
}
save(); c++;
break;
}
if ( *c == EOS ) {
state = ST_END; err = ERR_SQ_OPEN_AT_EOS;
break;
}
assert(0);
case ST_ARG:
if ( *c == SQ || *c == DQ ) {
qc = *c; c++; state = ST_QUOTE;
break;
}
if ( is_delim(*c) || *c == EOS ) {
push();
state = (*c == EOS) ? ST_END : ST_DELIM;
c++;
break;
}
if ( *c == BS ) {
c++;
if ( *c == NL ) {
c++;
break;
}
if ( *c == EOS ) {
state = ST_END; err = ERR_BS_AT_EOS;
break;
}
}
/* All other cases, incl. character after BS */
save(); c++;
break;
default:
assert(0);
}
}
return ( err != ERR_OK ) ? -1 : flags;
}
/**********************************************************************/
#if 0
int
main (int argc, char *argv[])
{
char *my_argv[12];
int my_argc, i, r;
if ( argc != 2 ) {
printf("Usage is: %s: <string to split>\n", argv[0]);
exit(EXIT_FAILURE);
}
printf("String to split is: [%s]\n", argv[1]);
r = split_quoted(argv[1], &my_argc, my_argv, 12);
if ( r < 0 ) {
printf("Spliting failed!\n");
exit(EXIT_FAILURE);
}
printf("Split ok. SPLIT_DROP is %s, SPLIT_TRUNC is %s\n",
(r & SPLIT_DROP) ? "ON" : "off",
(r & SPLIT_TRUNC) ? "ON" : "off");
for (i = 0; i < my_argc; i++)
printf("%02d : [%s]\n", i, my_argv[i]);
return EXIT_SUCCESS;
}
#endif
/**********************************************************************/
/*
* Local Variables:
* mode:c
* tab-width: 4
* c-basic-offset: 4
* indent-tabs-mode: nil
* End:
*/
|
