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This commit was generated by cvs2svn to compensate for changes in r2,

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3 b7a2c559-68d2-44c3-8de9-860c34a00d81
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uz
2000-05-28 13:40:48 +00:00
parent 579491e8a4
commit 53dd513176
847 changed files with 91345 additions and 0 deletions
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97
src/ca65/strexpr.c Normal file
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/*****************************************************************************/
/* */
/* strexpr.c */
/* */
/* String expressions for the ca65 macroassembler */
/* */
/* */
/* */
/* (C) 2000 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@musoftware.de */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
/* warranty. In no event will the authors be held liable for any damages */
/* arising from the use of this software. */
/* */
/* Permission is granted to anyone to use this software for any purpose, */
/* including commercial applications, and to alter it and redistribute it */
/* freely, subject to the following restrictions: */
/* */
/* 1. The origin of this software must not be misrepresented; you must not */
/* claim that you wrote the original software. If you use this software */
/* in a product, an acknowledgment in the product documentation would be */
/* appreciated but is not required. */
/* 2. Altered source versions must be plainly marked as such, and must not */
/* be misrepresented as being the original software. */
/* 3. This notice may not be removed or altered from any source */
/* distribution. */
/* */
/*****************************************************************************/
#include <stdio.h>
#include "error.h"
#include "expr.h"
#include "scanner.h"
#include "strexpr.h"
/*****************************************************************************/
/* Code */
/*****************************************************************************/
const char* StringExpression (void)
/* Evaluate a string expression. If there are no errors, the function will
* place the string into the token attribute buffer SVal and the token will
* be TOK_STRCON. A pointer to the buffer is returned.
* If there was an error, a NULL pointer is returned.
*/
{
char Buf [sizeof (SVal)];
/* Check for a string constant or a function that returns a string */
switch (Tok) {
case TOK_STRING:
NextTok ();
ConsumeLParen ();
if (Tok == TOK_IDENT) {
/* Save the identifier, then skip it */
strcpy (Buf, SVal);
NextTok ();
} else {
/* Numeric expression */
long Val = ConstExpression ();
sprintf (Buf, "%ld", Val);
}
if (Tok != TOK_RPAREN) {
Error (ERR_RPAREN_EXPECTED);
}
/* Overwrite the token, do not skip it! */
strcpy (SVal, Buf);
Tok = TOK_STRCON;
break;
case TOK_STRCON:
/* We already have a string */
break;
default:
/* Error - no string constant */
return 0;
}
/* Return a pointer to the buffer */
return SVal;
}