strcmp argument type error

I am trying not to use isSpace function so the only thing came to mind is strcpy but I am g开发者_如何学Cetting an error

while ( walker > 0 &&   strcmp(a[walker - 1],space_const) )

Warning 86: argument 1 conflicts with formal definition

Anyone know how to fix this issue? space_const is a char initialized as " "

char* strTrim(char* string)
{
 char* a= string;

 char delims[3];
 char space_const[] =" ";
 char syntax_const[]=" \t\n\v";
 size_t walker = strlen ( a );
 strcpy(delims,space_const);
 /* Trim trailing spaces */
 while ( walker > 0 &&   strcmp(a[walker - 1],space_const) )
   --walker; 

 a[walker] = '\0';

 /* Trim leading spaces */
 walker = strspn ( a,syntax_const);
 memmove ( a, a + walker, strlen ( a + walker ) + 1 );
 return extractCmd(a ,space_const );
}

You are trying to compare a character (small integer) and a string.

char* a= string;
/*... */

strcmp(a[walker - 1], space_const);
         ^ character

strcmp looks like this

int strcmp(const char *s1, const char *s2);
                  ^ string        ^ string

It's likely you want something like:

(a[walker - 1] == ' ' || a[walker - 1] == '\t' || ..)

You should write a function. but then you would end up rewriting isspace.

Why can't you use isspace in the first place ?

By adding brackets after the variable a[], you have made it a char. You must then dereference it back into a pointer using the ampersand &; Such as:

while ( walker > 0 &&   strnicmp(&a[walker - 1],space_const, strlen(space_const)) ) 

Be very careful here, it looks like this could be used for a buffer overflow since the passed in string is not being validated.