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From: rahul143 <[email protected]>
To: [email protected]
Subject: Exception Handling in C-Language Functions?
Date: Sun, 2 Dec 2012 21:18:57 -0800 (PST)
Message-ID: <[email protected]> (raw)
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I have the created a C-Language function (code is below).  Now, I 
wonder: How do I handle exceptions, for example if malloc cannot assign 
the necessary memory?  Do "palloc" and "pfree" handle such a case 
cleanly?  Should I simply use an "assert"? 

#include "postgres.h" 
#include <string.h> 
#include <stdlib.h> 
#include "fmgr.h" 
#include "libinn.h" 

PG_FUNCTION_INFO_V1(ffiinews_uwildmat); 

/* Wrapper for INN's function uwildmat.  Needs parameters in UTF-8. */ 
Datum ffiinews_uwildmat(PG_FUNCTION_ARGS) { 
    VarChar *text = PG_GETARG_VARCHAR_P(0); 
    VarChar *pattern = PG_GETARG_VARCHAR_P(1); 
    int text_len = VARSIZE(text)-VARHDRSZ; 
    int pattern_len = VARSIZE(pattern)-VARHDRSZ; 
    char *tmp_text = (char *)malloc(text_len+1); 
    if (tmp_text == NULL) 
        ; /* What now? */ 
    char *tmp_pattern = (char *)malloc(pattern_len+1); 
    if (tmp_pattern == NULL) 
        ; /* What now? */ 
    strncpy(tmp_text, VARDATA(text), text_len); 
    tmp_text[text_len] = '\0'; 
    strncpy(tmp_pattern, VARDATA(pattern), pattern_len); 
    tmp_pattern[pattern_len] = '\0'; 
    bool matches = uwildmat(tmp_text, tmp_pattern); 



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