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355 lines
7 KiB
C
355 lines
7 KiB
C
/*--------------------------------*-C-*---------------------------------*
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* File: sltoken.c
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*
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* Descript: ---
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*
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* Requires: ---
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*
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* Public: SLexpand_escaped_char ();
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* SLexpand_escaped_string ();
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* SLang_extract_token ();
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* SLang_guess_type ();
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* SLatoi ();
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*
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* Private: ---
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*
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* Notes: ---
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*
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* Copyright (c) 1992, 1995 John E. Davis
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* All rights reserved.
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*
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* You may distribute under the terms of either the GNU General Public
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* License or the Perl Artistic License.
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\*----------------------------------------------------------------------*/
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#include "config.h"
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#include <stdio.h>
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#ifdef HAVE_STDLIB_H
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# include <stdlib.h>
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#endif
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#include <string.h>
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#include "slang.h"
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#include "_slang.h"
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/* There are non-zeros at positions "\t %()*,/:;[]{}" */
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static unsigned char special_chars[256] =
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{
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/* 0 */ 0,0,0,0,0,0,0,0, 0,'\t',0,0,0,0,0,0,
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/* 16 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 32 */ ' ',0,0,0,0,'%',0,0, '(',')','*',0,',',0,0,'/',
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/* 48 */ 0,0,0,0,0,0,0,0, 0,0,':',';',0,0,0,0,
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/* 64 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 80 */ 0,0,0,0,0,0,0,0, 0,0,0,'[',0,']',0,0,
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/* 96 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 112 */ 0,0,0,0,0,0,0,0, 0,0,0,'{',0,'}',0,0,
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/* 8-bit characters */
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/* 128 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 144 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 160 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 176 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 192 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 208 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 224 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0,
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/* 240 */ 0,0,0,0,0,0,0,0, 0,0,0,0,0,0,0,0
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};
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char *SLexpand_escaped_char(char *p, char *ch)
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{
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int i = 0;
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int max = 0, num, base = 0;
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char ch1;
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ch1 = *p++;
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switch (ch1)
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{
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default: num = ch1; break;
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case 'n': num = '\n'; break;
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case 't': num = '\t'; break;
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case 'v': num = '\v'; break;
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case 'b': num = '\b'; break;
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case 'r': num = '\r'; break;
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case 'f': num = '\f'; break;
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case 'E': case 'e': num = 27; break;
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case 'a': num = 7;
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break;
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/* octal */
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case '0': case '1': case '2': case '3':
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case '4': case '5': case '6': case '7':
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max = '7';
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base = 8; i = 2; num = ch1 - '0';
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break;
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case 'd': /* decimal -- S-Lang extension */
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base = 10;
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i = 3;
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max = '9';
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num = 0;
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break;
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case 'x': /* hex */
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base = 16;
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max = '9';
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i = 2;
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num = 0;
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break;
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}
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while (i--)
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{
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ch1 = *p;
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if ((ch1 <= max) && (ch1 >= '0'))
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{
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num = base * num + (ch1 - '0');
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}
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else if (base == 16)
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{
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ch1 |= 0x20;
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if ((ch1 < 'a') || ((ch1 > 'f'))) break;
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num = base * num + 10 + (ch1 - 'a');
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}
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else break;
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p++;
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}
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*ch = (char) num;
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return p;
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}
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void SLexpand_escaped_string (register char *s, register char *t,
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register char *tmax)
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{
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char ch;
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while (t < tmax)
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{
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ch = *t++;
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if (ch == '\\')
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{
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t = SLexpand_escaped_char (t, &ch);
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}
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*s++ = ch;
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}
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*s = 0;
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}
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int SLang_extract_token (char **linep, char *word_parm, int byte_comp)
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{
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register char ch, *line, *word = word_parm;
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int string;
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char ch1;
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char *word_max;
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word_max = word + 250;
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line = *linep;
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/* skip white space */
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while (((ch = *line) == ' ')
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|| (ch == '\t')) line++;
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if ((!ch) || (ch == '\n'))
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{
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*linep = line;
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return(0);
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}
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*word++ = ch;
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line++;
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/* Look for -something and rule out --something and -= something */
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if ((ch == '-') &&
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(*line != '-') && (*line != '=') && ((*line > '9') || (*line < '0')))
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{
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*word = 0;
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*linep = line;
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return 1;
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}
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if (ch == '"') string = 1; else string = 0;
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if (ch == '\'')
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{
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if ((ch = *line++) != 0)
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{
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if (ch == '\\')
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{
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line = SLexpand_escaped_char(line, &ch1);
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ch = ch1;
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}
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if (*line++ == '\'')
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{
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--word;
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sprintf(word, "%d", (int) ((unsigned char) ch));
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word += strlen (word); ch = '\'';
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}
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else SLang_Error = SYNTAX_ERROR;
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}
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else SLang_Error = SYNTAX_ERROR;
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}
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else if (!special_chars[(unsigned char) ch])
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{
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while (ch = *line++,
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(ch > '"') ||
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((ch != '\n') && (ch != 0) && (ch != '"')))
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{
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if (string)
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{
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if (ch == '\\')
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{
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ch = *line++;
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if ((ch == 0) || (ch == '\n')) break;
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if (byte_comp) *word++ = '\\';
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else
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{
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line = SLexpand_escaped_char(line - 1, &ch1);
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ch = ch1;
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}
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}
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}
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else if (special_chars[(unsigned char) ch])
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{
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line--;
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break;
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}
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*word++ = ch;
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if (word > word_max)
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{
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SLang_doerror ("Token to large.");
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break;
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}
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}
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}
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if ((!ch) || (ch == '\n')) line--;
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if ((ch == '"') && string) *word++ = '"'; else if (string) SLang_Error = SYNTAX_ERROR;
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*word = 0;
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*linep = line;
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/* massage variable-- and ++ into --variable, etc... */
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if (((int) (word - word_parm) > 2)
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&& (ch = *(word - 1), (ch == '+') || (ch == '-'))
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&& (ch == *(word - 2)))
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{
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word--;
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while (word >= word_parm + 2)
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{
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*word = *(word - 2);
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word--;
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}
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*word-- = ch;
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*word-- = ch;
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}
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return(1);
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}
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int SLang_guess_type (char *t)
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{
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char *p;
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register char ch;
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if (*t == '-') t++;
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p = t;
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#ifdef FLOAT_TYPE
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if (*p != '.')
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{
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#endif
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while ((*p >= '0') && (*p <= '9')) p++;
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if (t == p) return(STRING_TYPE);
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if ((*p == 'x') && (p == t + 1)) /* 0x?? */
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{
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p++;
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while (ch = *p,
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((ch >= '0') && (ch <= '9'))
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|| (((ch | 0x20) >= 'a') && ((ch | 0x20) <= 'f'))) p++;
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}
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if (*p == 0) return(INT_TYPE);
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#ifndef FLOAT_TYPE
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return(STRING_TYPE);
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#else
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}
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/* now down to float case */
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if (*p == '.')
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{
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p++;
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while ((*p >= '0') && (*p <= '9')) p++;
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}
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if (*p == 0) return(FLOAT_TYPE);
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if ((*p != 'e') && (*p != 'E')) return(STRING_TYPE);
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p++;
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if ((*p == '-') || (*p == '+')) p++;
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while ((*p >= '0') && (*p <= '9')) p++;
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if (*p != 0) return(STRING_TYPE); else return(FLOAT_TYPE);
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#endif
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}
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int SLatoi (unsigned char *s)
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{
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register unsigned char ch;
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register unsigned int value;
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register int base;
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if (*s != '0') return atoi((char *) s);
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/* look for 'x' which indicates hex */
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s++;
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if ((*s | 0x20) == 'x')
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{
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base = 16;
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s++;
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if (*s == 0)
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{
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SLang_Error = SYNTAX_ERROR;
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return -1;
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}
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}
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else base = 8;
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value = 0;
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while ((ch = *s++) != 0)
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{
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char ch1 = ch | 0x20;
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switch (ch1)
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{
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default:
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SLang_Error = SYNTAX_ERROR;
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break;
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case '8':
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case '9':
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if (base != 16) SLang_Error = SYNTAX_ERROR;
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/* drop */
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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ch1 -= '0';
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break;
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case 'a':
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case 'b':
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case 'c':
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case 'd':
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case 'e':
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case 'f':
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if (base != 16) SLang_Error = SYNTAX_ERROR;
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ch1 = (ch1 - 'a') + 10;
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break;
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}
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value = value * base + ch1;
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}
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return (int) value;
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}
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