token.c
上传用户:mei_mei897
上传日期:2007-01-05
资源大小:82k
文件大小:7k
- /* -------------------------------------------------------------------- */
- /* SMS Client, send messages to mobile phones and pagers */
- /* */
- /* token.c */
- /* */
- /* Copyright (C) 1997,1998 Angelo Masci */
- /* */
- /* This library is free software; you can redistribute it and/or */
- /* modify it under the terms of the GNU Library General Public */
- /* License as published by the Free Software Foundation; either */
- /* version 2 of the License, or (at your option) any later version. */
- /* */
- /* This library 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 */
- /* Library General Public License for more details. */
- /* */
- /* You should have received a copy of the GNU Library General Public */
- /* License along with this library; if not, write to the Free */
- /* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
- /* */
- /* You can contact the author at this e-mail address: */
- /* */
- /* angelo@styx.demon.co.uk */
- /* */
- /* -------------------------------------------------------------------- */
- /* $Id$
- -------------------------------------------------------------------- */
- #include <stdio.h>
- #include <ctype.h>
- #include <string.h>
- #include "token.h"
- #include "common.h"
- /* -------------------------------------------------------------------- */
- /* -------------------------------------------------------------------- */
- char *get_line(char *str, int n, int *line_count, FILE *fp)
- {
- char *ptr;
- (*line_count)++;
- while(fgets(str, n, fp) != NULL)
- {
- ptr = str;
- while(isspace(*ptr))
- { ptr++;
- }
- if (*ptr != ' ')
- { return str;
- }
- (*line_count)++; /* A blank line was skipped */
- /* so increment the line count */
- }
- return NULL;
- }
- /* -------------------------------------------------------------------- */
- /* -------------------------------------------------------------------- */
- int escape_char_token(char *token, int maxlen, char *ptr, char **eptr)
- {
- int type;
- ptr++;
- if (*ptr == 'a')
- { /* a */
- type = ALERT_TOKEN;
- token[0] = 'f';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 'b')
- { /* b */
- type = BACKSPACE_TOKEN;
- token[0] = 'b';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 'f')
- { /* f */
- type = FORMFEED_TOKEN;
- token[0] = 'f';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 'n')
- { /* n */
- type = NEWLINE_TOKEN;
- token[0] = 'n';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 'r')
- { /* r */
- type = CARRIAGE_RETURN_TOKEN;
- token[0] = 'r';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 't')
- { /* t */
- type = HORIZONTAL_TAB_TOKEN;
- token[0] = 't';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 'v')
- { /* v */
- type = VERTICLE_TAB_TOKEN;
- token[0] = 'v';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == 'x')
- { /* x */
- int low_nibble,
- high_nibble;
- ptr++;
- if (isxdigit(*ptr))
- {
- if ((*ptr >= '0') && (*ptr <= '9'))
- {
- high_nibble = (*ptr - '0') << 4;
- }
- else
- if ((*ptr >= 'a') && (*ptr <= 'f'))
- {
- high_nibble = (10 + (*ptr - 'a')) << 4;
- }
- else
- { high_nibble = (10 + (*ptr - 'A')) << 4;
- }
- ptr++;
- if (isxdigit(*ptr))
- {
- if ((*ptr >= '0') && (*ptr <= '9'))
- {
- low_nibble = (*ptr - '0');
- }
- else
- if ((*ptr >= 'a') && (*ptr <= 'f'))
- {
- low_nibble = (10 + (*ptr - 'a'));
- }
- else
- { low_nibble = (10 + (*ptr - 'A'));
- }
- type = HEX_TOKEN;
- token[0] = high_nibble + low_nibble;
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- { type = ERROR_HEX_TOKEN;
- ptr -= 3;
- token[0] = *ptr++;
- token[1] = *ptr++;
- token[2] = *ptr++;
- token[3] = ' ';
- *eptr = ptr;
- }
- }
- else
- { type = ERROR_HEX_TOKEN;
- ptr -= 2;
- token[0] = *ptr++;
- token[1] = *ptr++;
- token[2] = ' ';
- *eptr = ptr;
- }
- }
- else
- if (*ptr == '\')
- { /* */
- type = BACKSLASH_TOKEN;
- token[0] = '\';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == '"')
- { /* Quote */
- type = QUOTE_TOKEN;
- token[0] = '"';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if (*ptr == ''')
- { /* Single Quote */
- type = SINGLE_QUOTE_TOKEN;
- token[0] = ''';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- { type = BACKSLASH_TOKEN;
- token[0] = '\';
- token[1] = ' ';
- *eptr = ptr;
- }
- return type;
- }
- /* -------------------------------------------------------------------- */
- /* -------------------------------------------------------------------- */
- int isstring(char c)
- {
- if (isspace(c))
- { return FALSE;
- }
- if ((c != '"') &&
- (c != ''') &&
- (c != '#') &&
- (c != '=') &&
- (c != ' ') &&
- (c != 'n'))
- { return TRUE;
- }
- return FALSE;
- }
-
- /* -------------------------------------------------------------------- */
- /* -------------------------------------------------------------------- */
- int get_token(char *token, int maxlen, char *ptr, char **eptr)
- {
- int type,
- i;
- while (isspace(*ptr)) /* Skip white space */
- { ptr++;
- }
- if (isstring(*ptr))
- {
- type = STRING_TOKEN;
- for (i=0; i<(maxlen -1); i++)
- {
- if (*ptr == ' ')
- { break;
- }
- if (!isstring(*ptr))
- { break;
- }
- if (*ptr == '\')
- {
- char etoken[128];
- escape_char_token(etoken, maxlen, ptr, &ptr);
- token[i] = ' ';
- sms_strcat(token, etoken);
- continue;
- }
- token[i] = *ptr;
- ptr++;
- }
-
- token[i] = ' ';
- *eptr = ptr;
- }
- else
- if (*ptr == '"') /* Quoted String */
- { /* All characters within */
- /* doublequotes */
- /* If missing closing quote */
- /* Quoted String Error token */
- /* returned */
- char etoken[128];
- type = QUOTED_STRING_TOKEN;
- ptr++;
- for (i=0; i<(maxlen -1); i++)
- {
- if (*ptr == ' ')
- { break;
- }
- if (*ptr == '\')
- {
- escape_char_token(etoken, maxlen, ptr, &ptr);
- token[i] = ' ';
- sms_strcat(token, etoken);
- continue;
- }
- else
- if (*ptr == '"')
- { break;
- }
- token[i] = *ptr;
- ptr++;
- }
-
- if (*ptr != '"')
- { type = QUOTED_STRING_ERROR_TOKEN;
- }
- else
- { ptr++;
- }
- token[i] = ' ';
- *eptr = ptr;
- }
- else
- if (*ptr == ''') /* Single Quoted String */
- { /* All characters within */
- /* singlequotes */
- /* If missing closing quote */
- /* Single Quoted String Error */
- /* token returned */
- type = SINGLE_QUOTED_STRING_TOKEN;
- ptr++;
- for (i=0; i<(maxlen -1); i++)
- {
- if (*ptr == ' ')
- { break;
- }
- if (*ptr == ''')
- { break;
- }
- token[i] = *ptr;
- ptr++;
- }
-
- if (*ptr != ''')
- { type = SINGLE_QUOTED_STRING_ERROR_TOKEN;
- }
- else
- { ptr++;
- }
- token[i] = ' ';
- *eptr = ptr;
- }
- else
- if (*ptr == '#') /* Comment */
- {
- type = COMMENT_TOKEN;
- ptr++;
- i = 0;
- while (*ptr != ' ')
- { token[i] = *ptr++;
- }
- token[i] = *ptr;
- *eptr = ptr;
- }
- else
- if (*ptr == '=') /* Assignment */
- {
- type = ASSIGNMENT_TOKEN;
- token[0] = '=';
- token[1] = ' ';
- *eptr = ++ptr;
- }
- else
- if ((*ptr == ' ') || (*ptr == 'n')) /* EOL */
- {
- type = NULL_TOKEN;
- token[0] = ' ';
- *eptr = ptr;
- }
- else
- { type = UNKNOWN_TOKEN;
- for (i=0; i<(maxlen -1); i++)
- {
- if (*ptr == ' ')
- { break;
- }
- token[i] = *ptr;
- ptr++;
- }
- token[i] = ' ';
- *eptr = ptr;
- }
- return type;
- }