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#define READER_H_PRIVATE
#include "reader.h"
rdr_ctx open_reader(
const char *fname,
const char* prepare_cmd,
const char** section_keywords) {
rdr_ctx c = { .section_keywords = section_keywords };
if (access(fname,F_OK) == -1) {
fprintf(stderr,"File '%s' does not exist.\n",fname);
exit(EXIT_FAILURE);
}
if (is_empty(prepare_cmd)) {
c.with_prepare = false;
c.source = fopen(fname,"r");
if (c.source == NULL) {
fprintf(stderr,"Can't open input file %s\n",fname);
exit(EXIT_FAILURE);
}
}
else {
c.with_prepare = true;
c.source = popen(prepare_cmd,"r");
if (c.source == NULL) {
fprintf(stderr,"Error when executing command %s\n",prepare_cmd);
exit(EXIT_FAILURE);
}
}
return c;
}
rdr_ctx open_reader_from_stream(FILE *source, const char** section_keywords) {
rdr_ctx c = {
.section_keywords = section_keywords,
.source = source,
.with_prepare = false
};
return c;
}
void read_next_block(rdr_ctx *rdr, t_section section) {
// End of input reached: There is nothing to do
if (rdr->next_section == END_OF_FILE) return;
// Next level deeper than requested: skip (i.e. ignore)
while (rdr->next_section > section) read_next_block( rdr, rdr->next_section);
// In any other case: Reset existing entries,
// starting with the requested section
for (int i=section; i<READER_MAX_LEVELS;i++) {
clear_table( & rdr->block[i] );
}
// Next chunk fits: read it
if (rdr->next_section == section) {
clear_table( & rdr->block[section] );
rdr->next_section = read_block(
rdr->source,
& rdr->block[section],
rdr->section_keywords);
}
}
// Look in several blocks, ascending levels, for a symbol
char* read_value(
const rdr_ctx *reader,
const char *name,
const t_section from,
const t_section to) {
for (int i = from; i >= to; i--) {
char *value = find_value(name, & reader->block[i]);
if (value) return value;
}
return NULL; // NOT FOUND
}
// Look only in the specified level
char* read_value_in_section(
const rdr_ctx *reader,
const char* name,
const t_section section) {
return find_value(name,&reader->block[section]);
}
// Scan a table of name/value-pairs for a given name
char* find_value(const char *name, const t_rawtab *table) {
for (int i=0; i<table->length; i++) {
if (equals(name,table->entry[i]->name)) {
return table->entry[i]->value;
}
}
return NULL;
}
t_section read_block(
FILE* source,
t_rawtab *table,
const char **section_keywords) {
char line[READER_MAX_LINESIZE];
for (int i = 1;
fgets(line ,READER_MAX_LINESIZE , source ) != NULL;
i++) {
// Exit condition: Next section marker
t_section section = section_line( line, section_keywords );
if (section != UNDEFINED) {
return section;
}
// Ignore empty lines
if (is_blank(line)) continue;
// Ignore comments
if (sscanf(line," #%c",&line[0])>0) continue;
// Find and store "name:value"
t_entry e;
int n = sscanf(line," %50[^ :] : %[^\n]",e.name,e.value);
switch (n) {
case 1:
e.value[0] = '\0'; // ... and continue with case 2:
case 2:
push_row(e,table);
break;
case 0:
printf("# reader: ignoring line %d: %s",i,line);
}
}
return END_OF_FILE;
}
t_section section_line(const char* line, const char** section_keywords) {
int i = 0;
while (true) {
const char *section = section_keywords[i];
if (is_empty(section)) return UNDEFINED;
if (trimmed_equals(line,section)) return i;
i++;
}
}
void push_row(t_entry entry, t_rawtab *table) {
if (table->length == READER_MAX_LINES_INPUT_FILE - 1) {
fprintf(stderr,
"reader.c: max input lines (%d) exceeded\n",
READER_MAX_LINES_INPUT_FILE);
}
t_entry *new = malloc( sizeof(t_entry ) );
if (new == NULL) {
fprintf(stderr,"Heap memory overflow in reader.c:push_row()\n");
exit(EXIT_FAILURE);
}
*new = entry;
table->entry[table->length] = new;
table->length++;
}
void clear_table(t_rawtab *table) {
for (int i=0; i<table->length; i++) {
free( table->entry[i]);
}
table->length = 0;
}
void close_reader(rdr_ctx *c) {
for (int i=0;i<=4;i++) clear_table( & c->block[i] );
if (c->source) {
int rc = (c->with_prepare ? pclose( c->source ) : fclose( c->source ) );
if (rc == -1) {
fprintf(stderr,"Error code %d when closing %sfixture file\n",
rc,
c->with_prepare ? "preprocessed " : "");
}
}
}
#undef READER_H_PRIVATE
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