From 5e6968ea86c7a586cf295b531e3f31da3f392e3a Mon Sep 17 00:00:00 2001
From: Russell Bryant <russell@russellbryant.com>
Date: Sat, 21 Jan 2006 23:05:19 +0000
Subject: const-ify some fields in the ast_exten and ast_include structures
 (issue #6270)

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@8411 65c4cc65-6c06-0410-ace0-fbb531ad65f3
---
 pbx.c | 51 ++++++++++++++++++++++++++-------------------------
 1 file changed, 26 insertions(+), 25 deletions(-)

diff --git a/pbx.c b/pbx.c
index 75ae5ea7f..3e77042ec 100644
--- a/pbx.c
+++ b/pbx.c
@@ -112,11 +112,11 @@ struct ast_context;
 struct ast_exten {
 	char *exten;			/*!< Extension name */
 	int matchcid;			/*!< Match caller id ? */
-	char *cidmatch;			/*!< Caller id to match for this extension */
+	const char *cidmatch;		/*!< Caller id to match for this extension */
 	int priority;			/*!< Priority */
-	char *label;			/*!< Label */
+	const char *label;		/*!< Label */
 	struct ast_context *parent;	/*!< The context this extension belongs to  */
-	char *app; 			/*!< Application to execute */
+	const char *app; 		/*!< Application to execute */
 	void *data;			/*!< Data to use (arguments) */
 	void (*datad)(void *);		/*!< Data destructor */
 	struct ast_exten *peer;		/*!< Next higher priority with our extension */
@@ -127,8 +127,8 @@ struct ast_exten {
 
 /*! \brief ast_include: include= support in extensions.conf */
 struct ast_include {
-	char *name;		
-	char *rname;				/*!< Context to include */
+	const char *name;		
+	const char *rname;			/*!< Context to include */
 	const char *registrar;			/*!< Registrar */
 	int hastime;				/*!< If time construct exists */
 	struct ast_timing timing;               /*!< time construct */
@@ -151,7 +151,7 @@ struct ast_sw {
 struct ast_ignorepat {
 	const char *registrar;
 	struct ast_ignorepat *next;
-	char pattern[0];
+	const char pattern[0];
 };
 
 /*! \brief ast_context: An extension context */
@@ -3881,21 +3881,19 @@ int ast_context_add_include2(struct ast_context *con, const char *value,
 		return -1;
 	}
 	
-	/* ... fill in this structure ... */
+	/* Fill in this structure. Use 'p' for assignments, as the fields
+	 * in the structure are 'const char *'
+	 */
 	p = new_include->stuff;
 	new_include->name = p;
-	strcpy(new_include->name, value);
+	strcpy(p, value);
 	p += strlen(value) + 1;
 	new_include->rname = p;
-	strcpy(new_include->rname, value);
-	c = new_include->rname;
-	/* Strip off timing info */
-	while(*c && (*c != '|')) 
-		c++; 
-	/* Process if it's there */
-	if (*c) {
-	        new_include->hastime = ast_build_timing(&(new_include->timing), c+1);
-		*c = '\0';
+	strcpy(p, value);
+	/* Strip off timing info, and process if it is there */
+	if ( (c = strchr(p, '|')) ) {
+		*c++ = '\0';
+	        new_include->hastime = ast_build_timing(&(new_include->timing), c);
 	}
 	new_include->next      = NULL;
 	new_include->registrar = registrar;
@@ -4137,7 +4135,10 @@ int ast_context_add_ignorepat2(struct ast_context *con, const char *value, const
 		errno = ENOMEM;
 		return -1;
 	}
-	strcpy(ignorepat->pattern, value);
+	/* The cast to char * is because we need to write the initial value.
+	 * The field is not supposed to be modified otherwise
+	 */
+	strcpy((char *)ignorepat->pattern, value);
 	ignorepat->next = NULL;
 	ignorepat->registrar = registrar;
 	ast_mutex_lock(&con->lock);
@@ -4371,26 +4372,26 @@ int ast_add_extension2(struct ast_context *con,
 		datad = null_datad;
 	tmp = calloc(1, length);
 	if (tmp) {
+		/* use p as dst in assignments, as the fields are const char * */
 		p = tmp->stuff;
 		if (label) {
 			tmp->label = p;
-			strcpy(tmp->label, label);
+			strcpy(p, label);
 			p += strlen(label) + 1;
 		}
 		tmp->exten = p;
-		p += ext_strncpy(tmp->exten, extension, strlen(extension) + 1) + 1;
+		p += ext_strncpy(p, extension, strlen(extension) + 1) + 1;
 		tmp->priority = priority;
-		tmp->cidmatch = p;
+		tmp->cidmatch = p;	/* but use p for assignments below */
 		if (callerid) {
-			p += ext_strncpy(tmp->cidmatch, callerid, strlen(callerid) + 1) + 1;
+			p += ext_strncpy(p, callerid, strlen(callerid) + 1) + 1;
 			tmp->matchcid = 1;
 		} else {
-			tmp->cidmatch[0] = '\0';
+			*p++ = '\0';
 			tmp->matchcid = 0;
-			p++;
 		}
 		tmp->app = p;
-		strcpy(tmp->app, application);
+		strcpy(p, application);
 		tmp->parent = con;
 		tmp->data = data;
 		tmp->datad = datad;
-- 
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