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/*
Copyright (C) 2003-2004 Douglas Thain and the University of Wisconsin
Copyright (C) 2005- The University of Notre Dame
This software is distributed under the GNU General Public License.
See the file COPYING for details.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "get_line.h"
#include "hash_table.h"
#include "stringtools.h"
struct chunk {
long pos;
long len;
char *logical_file_name;
struct chunk_set *parent;
struct chunk *next;
};
struct chunk_set {
char *physical_file_name;
struct chunk *head;
struct chunk *tail;
struct hash_table *file_table;
};
static void chunk_set_add_chunk(struct chunk_set *chunk_set, struct chunk *new_chunk)
{
if(!chunk_set->head) {
chunk_set->head = new_chunk;
chunk_set->tail = new_chunk;
} else {
chunk_set->tail->next = new_chunk;
chunk_set->tail = new_chunk;
}
hash_table_insert(chunk_set->file_table, new_chunk->logical_file_name, new_chunk);
}
static struct chunk *chunk_create(struct chunk_set *parent, char *logical_name, long pos)
{
struct chunk *chunk = malloc(sizeof(*chunk));
if(!chunk)
return NULL;
chunk->pos = pos;
chunk->len = 0;
chunk->logical_file_name = strdup(logical_name);
chunk->parent = parent;
chunk->next = NULL;
return chunk;
}
struct chunk_set *chunk_parse_file(char *file_name, char *ln_prefix, char *fc_prefix)
{
if(string_null_or_empty(file_name))
return NULL;
if(string_null_or_empty(ln_prefix) && string_null_or_empty(fc_prefix))
return NULL;
struct chunk_set *chunk_set = malloc(sizeof(*chunk_set));
chunk_set->physical_file_name = strdup(file_name);
chunk_set->head = NULL;
chunk_set->tail = NULL;
chunk_set->file_table = hash_table_create(0, NULL);
struct chunk *new_chunk = NULL;
int ln_prefix_len = 0;
if(ln_prefix)
ln_prefix_len = strlen(ln_prefix);
int fc_prefix_len = 0;
if(fc_prefix)
fc_prefix_len = strlen(fc_prefix);
FILE *fp = fopen(file_name, "r");
if (fp == NULL) return NULL;
long pos = 0;
char *line;
while((line = get_line(fp)) != NULL) {
if(!string_null_or_empty(ln_prefix) && strncmp(line, ln_prefix, ln_prefix_len) == 0) {
/* finish current chunk; begin new chunk */
pos = ftell(fp);
if(new_chunk) {
new_chunk->len = pos - strlen(line) - new_chunk->pos;
chunk_set_add_chunk(chunk_set, new_chunk);
}
new_chunk = chunk_create(chunk_set, line + ln_prefix_len, pos);
} else if(fc_prefix && strncmp(line, fc_prefix, fc_prefix_len) == 0) {
/* add to len? at any rate just continue */
continue;
} else if(string_null_or_empty(ln_prefix)) {
/* finish current chunk; begin new chunk */
pos = ftell(fp);
if(new_chunk) {
new_chunk->len = pos - strlen(line) - new_chunk->pos;
chunk_set_add_chunk(chunk_set, new_chunk);
}
new_chunk = chunk_create(chunk_set, line + ln_prefix_len, pos);
} else if(new_chunk) {
/* assert string_null_or_empty(fc_prefix) and we are
in the middle of a chunk */
/* add to len? at any rate just continue */
continue;
} else {
/* we are before all the chunks... just ignore */
continue;
}
}
if(!chunk_set->head) {
/* Chunks could not be parsed, so return null */
free(chunk_set->physical_file_name);
free(chunk_set);
return NULL;
}
return chunk_set;
}
char *chunk_read(struct chunk_set *chunk_set, const char *file_name, int *size)
{
struct chunk *the_chunk = (struct chunk *) hash_table_lookup(chunk_set->file_table, file_name);
FILE *fp = fopen(chunk_set->physical_file_name, "r");
fseek(fp, the_chunk->pos, SEEK_SET);
char *content = malloc(the_chunk->len);
ssize_t amt = fread(content, sizeof(*content), the_chunk->len, fp);
if(amt != the_chunk->len && ferror(fp)) {
/* error reading stream */
free(content);
fclose(fp);
return NULL;
}
*size = the_chunk->len;
fclose(fp);
return content;
}
int chunk_concat(const char *new_name, const char * const *filenames, int num_files, char *ln_prefix, char *fc_prefix)
{
FILE *old_file, *new_file;
char *line;
if(string_null_or_empty(ln_prefix) && string_null_or_empty(fc_prefix))
return 0;
new_file = fopen(new_name, "w");
if(!new_file)
return 0;
if(!ln_prefix)
ln_prefix = "";
if(!fc_prefix)
fc_prefix = "";
int i;
for(i = 0; i < num_files; ++i) {
const char *current_file_name = filenames[i];
old_file = fopen(current_file_name, "r");
if (old_file == NULL) return 0;
fprintf(new_file, "%s%s\n", ln_prefix, current_file_name);
while((line = get_line(old_file)) != NULL)
fprintf(new_file, "%s%s", fc_prefix, line);
fclose(old_file);
}
fclose(new_file);
return 1;
}
/* vim: set noexpandtab tabstop=4: */
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