138 lines
2.9 KiB
C
138 lines
2.9 KiB
C
/*
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* Copyright 1987, 1988 by MIT Student Information Processing Board
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*
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* For copyright info, see copyright.h.
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*/
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#include "ss_internal.h"
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#include "copyright.h"
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#ifndef lint
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static char const rcsid[] =
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"Header: parse.c,v 1.1 89/01/25 07:53:13 raeburn Exp ";
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#endif
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enum parse_mode { WHITESPACE, TOKEN, QUOTED_STRING };
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/*
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* parse(line_ptr, argc_ptr)
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*
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* Function:
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* Parses line, dividing at whitespace, into tokens, returns
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* the "argc" and "argv" values.
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* Arguments:
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* line_ptr (char *)
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* Pointer to text string to be parsed.
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* argc_ptr (int *)
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* Where to put the "argc" (number of tokens) value.
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* Returns:
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* argv (char **)
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* Series of pointers to parsed tokens.
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*/
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#define NEW_ARGV(old,n) (char **)realloc((char *)old,\
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(unsigned)(n+2)*sizeof(char*))
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char **ss_parse (sci_idx, line_ptr, argc_ptr)
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int sci_idx;
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register char *line_ptr;
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int *argc_ptr;
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{
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register char **argv, *cp;
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register int argc;
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register enum parse_mode parse_mode;
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argv = (char **) malloc (sizeof(char *));
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if (argv == (char **)NULL) {
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ss_error(sci_idx, errno, "Can't allocate storage");
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return(argv);
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}
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*argv = (char *)NULL;
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argc = 0;
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parse_mode = WHITESPACE; /* flushing whitespace */
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cp = line_ptr; /* cp is for output */
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while (1) {
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#ifdef DEBUG
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{
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printf ("character `%c', mode %d\n", *line_ptr, parse_mode);
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}
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#endif
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while (parse_mode == WHITESPACE) {
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if (*line_ptr == '\0')
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goto end_of_line;
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if (*line_ptr == ' ' || *line_ptr == '\t') {
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line_ptr++;
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continue;
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}
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if (*line_ptr == '"') {
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/* go to quoted-string mode */
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parse_mode = QUOTED_STRING;
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cp = line_ptr++;
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argv = NEW_ARGV (argv, argc);
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argv[argc++] = cp;
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argv[argc] = NULL;
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}
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else {
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/* random-token mode */
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parse_mode = TOKEN;
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cp = line_ptr;
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argv = NEW_ARGV (argv, argc);
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argv[argc++] = line_ptr;
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argv[argc] = NULL;
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}
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}
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while (parse_mode == TOKEN) {
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if (*line_ptr == '\0') {
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*cp++ = '\0';
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goto end_of_line;
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}
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else if (*line_ptr == ' ' || *line_ptr == '\t') {
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*cp++ = '\0';
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line_ptr++;
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parse_mode = WHITESPACE;
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}
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else if (*line_ptr == '"') {
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line_ptr++;
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parse_mode = QUOTED_STRING;
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}
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else {
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*cp++ = *line_ptr++;
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}
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}
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while (parse_mode == QUOTED_STRING) {
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if (*line_ptr == '\0') {
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ss_error (sci_idx, 0,
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"Unbalanced quotes in command line");
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free (argv);
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return NULL;
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}
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else if (*line_ptr == '"') {
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if (*++line_ptr == '"') {
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*cp++ = '"';
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line_ptr++;
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}
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else {
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parse_mode = TOKEN;
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}
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}
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else {
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*cp++ = *line_ptr++;
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}
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}
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}
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end_of_line:
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*argc_ptr = argc;
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#ifdef DEBUG
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{
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int i;
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printf ("argc = %d\n", argc);
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for (i = 0; i <= argc; i++)
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printf ("\targv[%2d] = `%s'\n", i,
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argv[i] ? argv[i] : "<NULL>");
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}
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#endif
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return(argv);
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}
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