rpmExpandMacros() is modified to be able to return more return codes

Now rpmExpandMacros() returns integer as a return value. Negative return
value implies failure. Return values can be more utilized in the future.
E. g. return value could specify how many macros were expanded in given
string.

build/files.c

@@ -1604,6 +1604,7 @@ static rpmRC readFilesManifest(rpmSpec spec, Package pkg, const char *path)
     FILE *fd = NULL;
     rpmRC rc = RPMRC_FAIL;
     unsigned int nlines = 0;
+    char *expanded;
 
     if (*path == '/') {
 	fn = rpmGetPath(path, NULL);
@@ -1624,8 +1625,7 @@ static rpmRC readFilesManifest(rpmSpec spec, Package pkg, const char *path)
     while (fgets(buf, sizeof(buf), fd)) {
 	if (handleComments(buf))
 	    continue;
-	char *expanded = rpmExpandMacros(spec->macros, buf, 0);
-	if (expanded == NULL) {
+	if(rpmExpandMacros(spec->macros, buf, &expanded, 0) < 0) {
 	    rpmlog(RPMLOG_ERR, _("line: %s\n"), buf);
 	    goto exit;
 	}

build/pack.c

@@ -132,8 +132,8 @@ static rpmRC addFileToTag(rpmSpec spec, const char * file,
     }
 
     while (fgets(buf, sizeof(buf), f)) {
-	char *expanded = rpmExpandMacros(spec->macros, buf, 0);
-	if (expanded == NULL) {
+	char *expanded;
+	if(rpmExpandMacros(spec->macros, buf, &expanded, 0) < 0) {
 	    rpmlog(RPMLOG_ERR, _("%s: line: %s\n"), fn, buf);
 	    goto exit;
 	}

build/parseSpec.c

@@ -169,7 +169,7 @@ static int restoreFirstChar(rpmSpec spec)
 static int expandMacrosInSpecBuf(rpmSpec spec, int strip)
 {
     char *lbuf = NULL;
-    int rc = 0, isComment = 0;
+    int isComment = 0;
 
      /* Don't expand macros (eg. %define) in false branch of %if clause */
     if (!spec->readStack->reading)
@@ -180,17 +180,17 @@ static int expandMacrosInSpecBuf(rpmSpec spec, int strip)
     if (lbuf[0] == '#')
 	isComment = 1;
 
-    lbuf = spec->lbuf;
 
-    spec->lbuf = rpmExpandMacros(spec->macros, lbuf, 0);
-    if (spec->lbuf == NULL) {
+    if(rpmExpandMacros(spec->macros, spec->lbuf, &lbuf, 0) < 0) {
 	rpmlog(RPMLOG_ERR, _("line %d: %s\n"),
-		spec->lineNum, lbuf);
-	goto exit;
-    } else {
-	spec->lbufSize = strlen(spec->lbuf) + 1;
+		spec->lineNum, spec->lbuf);
+	return 1;
     }
 
+    free(spec->lbuf);
+    spec->lbuf = lbuf;
+    spec->lbufSize = strlen(spec->lbuf) + 1;
+
     if (strip & STRIP_COMMENTS && isComment) {
 	char *bufA = lbuf;
 	char *bufB = spec->lbuf;
@@ -212,10 +212,7 @@ static int expandMacrosInSpecBuf(rpmSpec spec, int strip)
 		spec->lineNum, lbuf);
     }
 
-exit:
-    free(lbuf);
-
-    return rc;
+    return 0;
 }
 
 /* Return zero on success, 1 if we need to read more and -1 on errors. */

rpmio/macro.c

@@ -1471,7 +1471,7 @@ int expandMacros(void * spec, rpmMacroContext mc, char * sbuf, size_t slen)
     return rc;
 }
 
-char *rpmExpandMacros(rpmMacroContext mc, const char * sbuf, int flags)
+int rpmExpandMacros(rpmMacroContext mc, const char * sbuf, char ** obuf, int flags)
 {
     char *target = NULL;
     int rc;
@@ -1482,10 +1482,11 @@ char *rpmExpandMacros(rpmMacroContext mc, const char * sbuf, int flags)
 
     if (rc) {
 	free(target);
-	target = NULL;
+	return -1;
+    } else {
+	*obuf = target;
+	return 1;
     }
-
-    return target;
 }
 
 void

rpmio/rpmmacro.h

@@ -69,11 +69,12 @@ int	expandMacros	(void * spec, rpmMacroContext mc,
  * Expand macro into buffer.
  * @param mc		macro context (NULL uses global context).
  * @param sbuf		input macro to expand
+ * @param obuf		macro expansion (malloc'ed)
  * @param flags		flags (currently unused)
- * @return		macro expansion (malloc'ed) or NULL on failure
+ * @return		negative on failure
  */
-char	*rpmExpandMacros	(rpmMacroContext mc, const char * sbuf,
-					int flags);
+int	rpmExpandMacros	(rpmMacroContext mc, const char * sbuf,
+				char ** obuf, int flags);
 
 /** \ingroup rpmmacro
  * Add macro to context.