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/*
* sparr.c - Example of changing behavior of arrays in gawk.
* See testsparr.awk for usage.
*/
/*
* Copyright (C) 2012 the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "awk.h"
#include "spec_array.h"
int plugin_is_GPL_compatible;
typedef struct {
int load_file;
NODE *filename;
} sdata_t;
/* install_array --- install an array in the symbol table */
static NODE *
install_array(const char *name)
{
NODE *r;
r = lookup(name);
if (r == NULL)
r = install_symbol(estrdup(name, strlen(name)), Node_var_array);
switch (r->type) {
case Node_var_new:
r = force_array(r, false);
/* fall through */
case Node_var_array:
assoc_clear(r);
break;
default:
fatal(_("`%s' is not an array"), name);
}
return r;
}
/* fetch_SYS --- fetch routine for the array `SYS' */
static NODE *
fetch_SYS(NODE *symbol, NODE *subs, void *data)
{
force_string(subs);
if (strcmp(subs->stptr, "time") == 0)
return do_strftime(0);
return NULL;
}
/* store_SYS --- store routine for the array `SYS' */
static void
store_SYS(NODE *symbol, NODE *subs, NODE *val, void *data)
{
sdata_t *sd = (sdata_t *) data;
if (subs != NULL && val != NULL && val->type == Node_val) {
force_string(subs);
if (strcmp(subs->stptr, "readline") == 0) {
sd->load_file = true;
unref(sd->filename);
sd->filename = dupnode(val);
}
}
}
/* load_READLINE --- load routine for the array `READLINE' */
static void
load_READLINE(NODE *symbol, void *data)
{
sdata_t *sd = (sdata_t *) data;
NODE *file, *tmp;
FILE *fp;
static char linebuf[BUFSIZ];
int i;
bool long_line = false;
if (! sd->load_file) /* non-existent SYS["readline"] or already loaded */
return;
file = sd->filename;
force_string(file);
if (file->stlen == 0)
return;
assoc_clear(symbol);
if ((fp = fopen(file->stptr, "r" )) == NULL) {
warning(_("READLINE (%s): %s"), file->stptr, strerror(errno));
return;
}
for (i = 1; fgets(linebuf, sizeof(linebuf), fp ) != NULL; i++) {
NODE **lhs;
size_t sz;
sz = strlen(linebuf);
if (sz > 0 && linebuf[sz - 1] == '\n') {
linebuf[sz - 1] = '\0';
sz--;
if (long_line) {
long_line = false;
i--;
continue;
}
} else if (long_line) {
i--;
continue;
} else {
if (do_lint)
lintwarn(_("file `%s' does not end in newline or line # `%d' is too long"),
file->stptr, i);
long_line = true;
}
tmp = make_number(i);
lhs = assoc_lookup(symbol, tmp);
unref(tmp);
unref(*lhs);
*lhs = make_string(linebuf, sz);
}
fclose(fp);
sd->load_file = false; /* don't load this file again */
}
/* dlload --- load this library */
NODE *
dlload(NODE *obj, void *dl)
{
NODE *a1, *a2;
static sdata_t data;
a1 = install_array("SYS");
register_dyn_array(a1, fetch_SYS, store_SYS, & data);
a2 = install_array("READLINE");
register_deferred_array(a2, load_READLINE, & data);
return make_number((AWKNUM) 0);
}
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