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fix potential seg fault when using LEN() with a string greater than 80 characters (bug #4839)

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git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/v1-0@6240 65c4cc65-6c06-0410-ace0-fbb531ad65f3
This commit is contained in:
Russell Bryant
2005-07-28 17:40:46 +00:00
parent 120e4bc237
commit 8061ba32c3
1 changed files with 13 additions and 12 deletions
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25
pbx.c
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@@ -835,21 +835,22 @@ static void pbx_substitute_variables_temp(struct ast_channel *c, const char *var
if (c)
headp=&c->varshead;
*ret=NULL;
/* Now we have the variable name on cp3 */
if (!strncasecmp(var,"LEN(",4)) { /* ${LEN(<string>)} */
int len=strlen(var);
int len_len=4;
if (strrchr(var,')')) {
char cp3[80];
strncpy(cp3, var, sizeof(cp3) - 1);
cp3[len-len_len-1]='\0';
sprintf(workspace,"%d",(int)strlen(cp3));
*ret = workspace;
} else {
/* length is zero */
*ret = "0";
char *endparen, *string = ast_strdupa(var + 4);
int len = 0;
if (!string) {
ast_log(LOG_WARNING, "Out of memory!\n");
return;
}
if ((endparen = strrchr(string,')'))) {
*endparen = '\0';
len = strlen(string);
}
sprintf(workspace, "%d", len);
*ret = workspace;
} else if ((first=strchr(var,':'))) { /* : Remove characters counting from end or start of string */
strncpy(tmpvar, var, sizeof(tmpvar) - 1);
first = strchr(tmpvar, ':');