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