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/* -*- mode: c; c-file-style: "openbsd" -*- */
/*
* Copyright (c) 2013 Vincent Bernat <bernat@luffy.cx>
*
* 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.
*/
#include "client.h"
#include <string.h>
/**
* Tokenize the given line. We support quoted strings and escaped characters
* with backslash.
*
* @param line Line to tokenize.
* @param argv Will get an array of arguments tokenized.
* @param argc Will get the number of tokenized arguments.
* @return 0 on success, -1 on internal error, 1 on unmatched quotes
*/
int
tokenize_line(const char *line, int *argc, char ***argv)
{
int iargc = 0;
char **iargv = NULL;
const char ifs[] = " \n\t";
const char quotes[] = "'\"";
const char escapes[] = "\\";
char empty = 2; /* Empty character, will be removed from output
* but will mark a word. */
/* Escape handle. Also escape quoted characters. */
int escaped = 0;
int ipos = 0;
char quote = 0;
char input[2 * strlen(line) + 3]; /* 3 = 2 for '\n ' and 1 for \0 */
memset(input, 0, 2 * strlen(line) + 3);
for (int pos = 0; line[pos]; pos++) {
if (line[pos] == '#' && !escaped && !quote) break;
if (!escaped && strchr(escapes, line[pos]))
escaped = 1;
else if (!escaped && strchr(quotes, line[pos]) && !quote) {
input[ipos++] = empty;
input[ipos++] = '!';
quote = line[pos];
} else if (!escaped && quote == line[pos])
quote = 0;
else {
input[ipos++] = line[pos];
input[ipos++] = (escaped || quote) ? '!' : ' ';
escaped = 0;
}
}
if (escaped || quote) return 1;
/* Trick to not have to handle \0 in a special way */
input[ipos++] = ifs[0];
input[ipos++] = ' ';
/* Tokenize, we don't have to handle quotes anymore */
int wbegin = -1; /* Offset of the beginning of the current word */
#define CURRENT (input[2 * pos])
#define ESCAPED (input[2 * pos + 1] != ' ')
for (int pos = 0; CURRENT; pos++) {
if (wbegin == -1) {
if (!ESCAPED && strchr(ifs, CURRENT))
/* IFS while not in a word, continue. */
continue;
/* Start a word. */
wbegin = pos;
continue;
}
if (ESCAPED || !strchr(ifs, CURRENT)) /* Regular character in a word. */
continue;
/* End of word. */
char *word = calloc(1, pos - wbegin + 1);
if (!word) goto error;
int i, j;
for (i = wbegin, j = 0; i != pos; i++)
if (input[2 * i] != empty) word[j++] = input[2 * i];
char **nargv = realloc(iargv, sizeof(char *) * (iargc + 1));
if (!nargv) {
free(word);
goto error;
}
nargv[iargc++] = word;
iargv = nargv;
wbegin = -1;
}
*argc = iargc;
*argv = iargv;
return 0;
error:
tokenize_free(iargc, iargv);
return -1;
}
void
tokenize_free(int argc, char **argv)
{
while (argc)
free(argv[--argc]);
free(argv);
}
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