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/*-------------------------------------------------------------------------
* pg_array.c
*
* Functions for libpq array manipulation
* This is intended to contain functions to manage libpq arrays.
* This isn't likely to be comprehensive
*
* Copyright (c) 2004-2007, PostgreSQL Global Development Group
* Author: Joshua Tolley
*
* $Id: pg_array.c,v 1.6 2007/09/13 14:20:43 h-saito Exp $
*
*-------------------------------------------------------------------------
*/

#include "pg_array.h"

/* Text array format consists of leading and trailing curly braces. Values containing
* characters that might be confusing (backslashes, double-quotes, etc.) are double-
* quoted, and confusing characters are backslash-escaped */

/* pg_text_array_parse()
* Takes an input string as returned by PQgetvalue(), parses it as a text array, and
* builds an array of strings, which it returns, or NULL on error. pg_text_array also
* sets len to the number of strings in the array. THE USER IS RESPONSIBLE
* FOR FREEING CHAR ***OUTPUT, perhaps by calling pg_text_array_free. */

/* TODO: Add debugging/logging */

char ** pg_text_array_parse(char *input, int *len) {
char **results = NULL, **tmp;
char *incursor, *outcursor, *output, *start_element;
int escaped = 0, done_single_element = 0, done_all_elements = 0, i,
cursorlen, inputlen, elements = 0, outputlen, error = 0, in_quotes = 0;

inputlen = strlen(input);
if (!inputlen || inputlen < 3 || SIZE_MAX / inputlen < sizeof(char*)) return NULL;
incursor = input + 1;
while (!done_all_elements) {
in_quotes = 0;
if (*incursor == '"') {
incursor++;
in_quotes = 1;
}
/* else if (*incursor == ',') break; */
start_element = incursor;
outcursor = strpbrk(incursor, ",}");
if (!outcursor) return NULL;
/* FACT: outcursor - incursor >= 1 */
outputlen = outcursor - incursor + 1;
output = calloc(outputlen, sizeof(char));
if (!output) return NULL;
outcursor = output;
done_single_element = 0;
while (!done_single_element) {
if (!escaped) {
switch (*incursor) {
case '}':
done_single_element = 1;
done_all_elements = 1;
break;
case ',':
if (!in_quotes) done_single_element = 1;
break;
case '"':
in_quotes = 0;
done_single_element = 1;
incursor++;
if (*incursor == '}') done_all_elements = 1;
break;
}
}
if (!done_single_element) {
if (!escaped && *incursor == '\\') escaped = 1;
else {
if (outcursor - output >= outputlen) {
cursorlen = outcursor - output;
outcursor = strpbrk(incursor + 1, ",}");
if (!outcursor) {
error = 1;
break;
}
outputlen = outcursor - start_element;
outcursor = realloc(output, outputlen * sizeof(char));
if (!outcursor) {
error = 1;
break;
}
output = outcursor;
outcursor = output + cursorlen;
}
if (escaped) {
escaped = 0;
*outcursor = *incursor;
outcursor++;
}
else {
*outcursor = *incursor;
outcursor++;
}
}
}
if (done_single_element) {
elements++;
memset(outcursor, 0, outputlen - (outcursor - output));
if (results) {
tmp = realloc(results, elements * sizeof(char*));
if (!tmp) {
error = 1;
break;
}
results = tmp;
}
else {
results = calloc(1, sizeof(char*));
if (!results) {
error = 1;
break;
}
}
results[elements - 1] = output;
}
if (!done_all_elements) {
incursor++;
if (incursor - input >= inputlen) {
error = 1;
break;
}
}
}
if (error) break;
}
if (error) {
for (i = 0; i < elements; i++)
free(results[i]);
free(results);
free(output);
return NULL;
}
*len = elements;
return results;
}

/* pg_text_array_free()
* Frees an array of strings such as is returned by pg_text_array_parse() */
void pg_text_array_free(char **array, int len) {
int i;
for (i = 0; i < len; i++)
free(array[i]);
free(array);
}
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