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/*
* IF.C - if command.
*
* Comments:
*
* 16 Jul 1998 (Hans B Pufal)
* started.
*
* 16 Jul 1998 (John P Price)
* Seperated commands into individual files.
*
* 27-Jul-1998 (John P Price <linux-guru@gcfl.net>)
* - added config.h include
*
* 1999/11/04 ska
* + bugfix: if: case-insensitive compare in "==" format
* + bugfix: if: added support for quoted operands of "==" format
* + add: if: detailed error messages
* + bugfix: if: keyword "EXIST" misspelled
*
* 2000/07/05 Ron Cemer
* bugfix: renamed skipwd() -> skip_word() to prevent duplicate symbol
*/
#include "../config.h"
#include <assert.h>
#include <ctype.h>
#include <dir.h>
#include <dos.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "../include/batch.h"
#include "../include/cmdline.h"
#include "../include/command.h"
#include "../err_fcts.h"
int cmd_if(char *param)
{
#define X_EXEC 1
int x_flag = 0; /* when set cause 'then' clause to be exec'ed */
int negate = 0; /* NOT keyword present */
char *pp;
/* First check if param string begins with word 'not' */
assert(param);
if(matchtok(param, "not"))
negate = X_EXEC; /* Remember 'NOT' */
/* Check for 'exist' form */
if(matchtok(param, "exist")) {
struct ffblk f;
if(!*param) {
/* syntax error */
error_if_exist();
return 0;
}
pp = skip_word(param);
*pp++ = '\0';
if(FINDFIRST(param, &f, FA_NORMAL) == 0)
x_flag = X_EXEC;
}
/* Check for 'errorlevel' form */
else if(matchtok(param, "errorlevel")) {
int n = 0;
#if 0
if(!isdigit(*param)) {
error_if_errorlevel();
return 0;
}
pp = param;
do n = n * 10 + (*pp - '0');
while (isdigit(*++pp));
if(*pp && !isargdelim(*pp)) {
error_if_errorlevel_number();
return 0;
}
#else
/* Add this COMMAND bug as someone tries to use:
IF ERRORLEVEL H<upper-case_letter>
-or-
IF ERRORLEVEL x<lower-case_letter>
to match the errorlevel against drive letters.
NOT supported by 4dos or WinNT.
HA --> maps to errorlevel 1
xa --> same
HB & xb --> to 2
a.s.o.
*/
if(!*param) {
error_if_errorlevel();
return 0;
}
pp = param;
do n = n * 10 + (*pp - '0');
while(*++pp && !isargdelim(*pp));
n &= 255;
dprintf( ("IF: checking for ERRORLEVEL >= %u\n", n) );
#endif
if(errorlevel >= n)
x_flag = X_EXEC;
}
/* Check that '==' is present, syntax error if not */
else {
size_t len;
char *r; /* right operand */
pp = skipqword(param, "==");
if(*pp != '=' || pp[1] != '=') {
error_syntax(0);
return 0;
}
*pp = '\0'; /* param[] points to the left operand */
/* skip over the '==' and subsquent spaces and
assign the end of the right operator to pp */
pp = skipqword(r = ltrimcl(pp + 2), 0);
/* now: param := beginning of the left operand
r := beginning of the right operand
pp := end of right operand
*/
rtrimcl(param); /* ensure that spurious whitespaces are ignored */
len = strlen(param);
if((pp - r) == len
&& memcmp(param, r, len) == 0) /* strings differ */
x_flag = X_EXEC;
}
if(x_flag ^ negate) /* perform the command */
if(!*(pp = ltrimcl(pp)))
error_if_command();
else
parsecommandline(pp, FALSE);
return 0;
}
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