/* $OpenBSD: tokenizer.c,v 1.11 2009/10/27 23:59:28 deraadt Exp $ */ /* $NetBSD: tokenizer.c,v 1.13 2003/10/18 23:48:42 christos Exp $ */ /*- * Copyright (c) 1992, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Christos Zoulas of Cornell University. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "config.h" /* * tokenize.c: Bourne shell like tokenizer */ #include #include #include "tokenizer.h" typedef enum { Q_none, Q_single, Q_double, Q_one, Q_doubleone } quote_t; #define IFS "\t \n" #define TOK_KEEP 1 #define TOK_EAT 2 #define WINCR 20 #define AINCR 10 #define tok_strdup(a) strdup(a) #define tok_malloc(a) malloc(a) #define tok_free(a) free(a) #define tok_realloc(a, b) realloc(a, b) struct tokenizer { char *ifs; /* In field separator */ int argc, amax; /* Current and maximum number of args */ char **argv; /* Argument list */ char *wptr, *wmax; /* Space and limit on the word buffer */ char *wstart; /* Beginning of next word */ char *wspace; /* Space of word buffer */ quote_t quote; /* Quoting state */ int flags; /* flags; */ }; private void tok_finish(Tokenizer *); /* tok_finish(): * Finish a word in the tokenizer. */ private void tok_finish(Tokenizer *tok) { *tok->wptr = '\0'; if ((tok->flags & TOK_KEEP) || tok->wptr != tok->wstart) { tok->argv[tok->argc++] = tok->wstart; tok->argv[tok->argc] = NULL; tok->wstart = ++tok->wptr; } tok->flags &= ~TOK_KEEP; } /* tok_init(): * Initialize the tokenizer */ public Tokenizer * tok_init(const char *ifs) { Tokenizer *tok = (Tokenizer *) tok_malloc(sizeof(Tokenizer)); if (tok == NULL) return NULL; tok->ifs = tok_strdup(ifs ? ifs : IFS); if (tok->ifs == NULL) { tok_free((ptr_t)tok); return NULL; } tok->argc = 0; tok->amax = AINCR; tok->argv = (char **) tok_malloc(sizeof(char *) * tok->amax); if (tok->argv == NULL) { tok_free((ptr_t)tok->ifs); tok_free((ptr_t)tok); return NULL; } tok->argv[0] = NULL; tok->wspace = (char *) tok_malloc(WINCR); if (tok->wspace == NULL) { tok_free((ptr_t)tok->argv); tok_free((ptr_t)tok->ifs); tok_free((ptr_t)tok); return NULL; } tok->wmax = tok->wspace + WINCR; tok->wstart = tok->wspace; tok->wptr = tok->wspace; tok->flags = 0; tok->quote = Q_none; return (tok); } /* tok_reset(): * Reset the tokenizer */ public void tok_reset(Tokenizer *tok) { tok->argc = 0; tok->wstart = tok->wspace; tok->wptr = tok->wspace; tok->flags = 0; tok->quote = Q_none; } /* tok_end(): * Clean up */ public void tok_end(Tokenizer *tok) { tok_free((ptr_t) tok->ifs); tok_free((ptr_t) tok->wspace); tok_free((ptr_t) tok->argv); tok_free((ptr_t) tok); } /* tok_line(): * Bourne shell like tokenizing * Return: * -1: Internal error * 3: Quoted return * 2: Unmatched double quote * 1: Unmatched single quote * 0: Ok */ public int tok_line(Tokenizer *tok, const char *line, int *argc, const char ***argv) { const char *ptr; for (;;) { switch (*(ptr = line++)) { case '\'': tok->flags |= TOK_KEEP; tok->flags &= ~TOK_EAT; switch (tok->quote) { case Q_none: tok->quote = Q_single; /* Enter single quote * mode */ break; case Q_single: /* Exit single quote mode */ tok->quote = Q_none; break; case Q_one: /* Quote this ' */ tok->quote = Q_none; *tok->wptr++ = *ptr; break; case Q_double: /* Stay in double quote mode */ *tok->wptr++ = *ptr; break; case Q_doubleone: /* Quote this ' */ tok->quote = Q_double; *tok->wptr++ = *ptr; break; default: return (-1); } break; case '"': tok->flags &= ~TOK_EAT; tok->flags |= TOK_KEEP; switch (tok->quote) { case Q_none: /* Enter double quote mode */ tok->quote = Q_double; break; case Q_double: /* Exit double quote mode */ tok->quote = Q_none; break; case Q_one: /* Quote this " */ tok->quote = Q_none; *tok->wptr++ = *ptr; break; case Q_single: /* Stay in single quote mode */ *tok->wptr++ = *ptr; break; case Q_doubleone: /* Quote this " */ tok->quote = Q_double; *tok->wptr++ = *ptr; break; default: return (-1); } break; case '\\': tok->flags |= TOK_KEEP; tok->flags &= ~TOK_EAT; switch (tok->quote) { case Q_none: /* Quote next character */ tok->quote = Q_one; break; case Q_double: /* Quote next character */ tok->quote = Q_doubleone; break; case Q_one: /* Quote this, restore state */ *tok->wptr++ = *ptr; tok->quote = Q_none; break; case Q_single: /* Stay in single quote mode */ *tok->wptr++ = *ptr; break; case Q_doubleone: /* Quote this \ */ tok->quote = Q_double; *tok->wptr++ = *ptr; break; default: return (-1); } break; case '\n': tok->flags &= ~TOK_EAT; switch (tok->quote) { case Q_none: tok_finish(tok); *argv = (const char **)tok->argv; *argc = tok->argc; return (0); case Q_single: case Q_double: *tok->wptr++ = *ptr; /* Add the return */ break; case Q_doubleone: /* Back to double, eat the '\n' */ tok->flags |= TOK_EAT; tok->quote = Q_double; break; case Q_one: /* No quote, more eat the '\n' */ tok->flags |= TOK_EAT; tok->quote = Q_none; break; default: return (0); } break; case '\0': switch (tok->quote) { case Q_none: /* Finish word and return */ if (tok->flags & TOK_EAT) { tok->flags &= ~TOK_EAT; return (3); } tok_finish(tok); *argv = (const char **)tok->argv; *argc = tok->argc; return (0); case Q_single: return (1); case Q_double: return (2); case Q_doubleone: tok->quote = Q_double; *tok->wptr++ = *ptr; break; case Q_one: tok->quote = Q_none; *tok->wptr++ = *ptr; break; default: return (-1); } break; default: tok->flags &= ~TOK_EAT; switch (tok->quote) { case Q_none: if (strchr(tok->ifs, *ptr) != NULL) tok_finish(tok); else *tok->wptr++ = *ptr; break; case Q_single: case Q_double: *tok->wptr++ = *ptr; break; case Q_doubleone: *tok->wptr++ = '\\'; tok->quote = Q_double; *tok->wptr++ = *ptr; break; case Q_one: tok->quote = Q_none; *tok->wptr++ = *ptr; break; default: return (-1); } break; } if (tok->wptr >= tok->wmax - 4) { size_t size = tok->wmax - tok->wspace + WINCR; char *s = (char *) tok_realloc(tok->wspace, size); if (s == NULL) return (-1); if (s != tok->wspace) { int i; for (i = 0; i < tok->argc; i++) { tok->argv[i] = (tok->argv[i] - tok->wspace) + s; } tok->wptr = (tok->wptr - tok->wspace) + s; tok->wstart = (tok->wstart - tok->wspace) + s; tok->wspace = s; } tok->wmax = s + size; } if (tok->argc >= tok->amax - 4) { char **p; tok->amax += AINCR; p = (char **) tok_realloc(tok->argv, tok->amax * sizeof(char *)); if (p == NULL) return (-1); tok->argv = p; } } }