parse_equal.c

openPBS的开放源代码

/*
*         OpenPBS (Portable Batch System) v2.3 Software License
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* Copyright (c) 1999-2000 Veridian Information Solutions, Inc.
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#include <pbs_config.h>   /* the master config generated by configure */

#include <ctype.h>
#include <stdlib.h>

static char ident[] = "@(#) $RCSfile: parse_equal.c,v $ $Revision: 2.1.10.4 $";

/*
 * parse_equal_string - parse a string of the form:
 *		name1 = value1[, value2 ...][, name2 = value3 [, value4 ...]]
 *	into <name1> <value1[, value2 ...>
 *	     <name2> <value3 [, value4 ...>
 *
 *	On the first call,
 *		*name will point to "name1"
 *		*value will point to "value1 ..." upto but not
 *			including the comma before "name2".
 *	On a second call, with start = (char *)0,
 *		*name will point to "name2"
 *		*value will point t0 "value3 ..."
 * Arguments:
 *	start is the start of the string to parse.  If called again with
 *	start  being a null pointer, it will resume parsing where it stoped
 * 	on the prior call.
 *
 * Returns:
 *	integer function return = 1 if  name and value are found,
 *				  0 if nothing (more) is parsed (null input)
 *				 -1 if a syntax error was detected.
 *	*name is set to point to the name string
 *	*value is set to point to the value string
 *	each string is null terminated.
 */

int parse_equal_string(start, name, value)
	char  *start;
	char **name;
	char **value;
{
	static char *pc;	/* where prior call left off */
	char        *backup;
	int	     quoting = 0;

	if (start != (char *)0)
		pc = start;

	if (*pc == '\0') {
		*name = (char *)0;
		return (0);	/* already at end, return no strings */
	}

	/* strip leading spaces */

	while (isspace((int)*pc) && *pc)
		pc++;

	if (*pc == '\0') {
		*name = (char *)0;	/* null name */
		return (0);
	} else if ((*pc == '=') || (*pc == ','))
		return (-1);	/* no name, return error */

	*name = pc;

	/* have found start of name, look for end of it */

	while ( !isspace((int)*pc) && (*pc != '=') && *pc)
		pc++;

	/* now look for =, while stripping blanks between end of name and = */

	while ( isspace((int)*pc) && *pc)
		*pc++ = '\0';
	if (*pc != '=')
		return (-1);	/* should have found a = as first non blank */
	*pc++ = '\0';

	/* that follows is the value string, skip leading white space */

	while ( isspace((int)*pc) && *pc)
		pc++;

	/* is the value string to be quoted ? */

	if ((*pc == '"') || (*pc == '\''))
		quoting = (int)*pc++;
	*value = pc;

	/*
	 * now go to first equal sign, or if quoted, the first equal sign
	 * after the close quote 
	 */

	if (quoting) {
		while ( (*pc != (char)quoting) && *pc)	/* look for matching */
			pc++;
		if (*pc)
			*pc = ' ';	/* change close quote to space */
		else 
			return (-1);
	}
	while ((*pc != '=') && *pc)
		pc++;

	if (*pc == '\0') {
		while (isspace((int)*--pc));
		if ( *pc == ',' )	/* trailing comma is a no no */
			return (-1);
		pc++;
		return (1);	/* no equal, just end of line, stop here */
	}
	
	/* back up to the first comma found prior to the equal sign */

	while (*--pc != ',')
		if (pc <= *value)	/* gone back too far, no comma, error */
			return (-1);
	backup = pc++;
	*backup = '\0';			/* null the comma */

	/* strip off any trailing white space */

	while (isspace((int)*--backup))
		*backup = '\0';
	return (1);
}