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/* grecs - Gray's Extensible Configuration System
Copyright (C) 2007-2022 Sergey Poznyakoff
Grecs 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.
Grecs 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 Grecs. If not, see <http://www.gnu.org/licenses/>. */
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include "grecs.h"
#include "grecs/json.h"
static void
printer(void *d, char const *buf, size_t size)
{
FILE *fp = d;
fwrite(buf, size, 1, fp);
}
struct json_format fmt = { 0, -1, printer, NULL };
static void
usage(const char *arg, FILE *fp, int code)
{
fprintf(fp,
"usage: %s [-file=FILE][-indent=N][-precision=N] [expr]\n",
arg);
exit(code);
}
int
main(int argc, char **argv)
{
char *progname = argv[0];
char *file = NULL;
char *input;
size_t size;
struct json_value *obj;
char *key = NULL;
while (--argc) {
char *arg = *++argv;
if (strncmp(arg, "-file=", 6) == 0)
file = arg + 6;
else if (strncmp(arg, "-indent=", 8) == 0)
fmt.indent = atoi(arg + 8);
else if (strncmp(arg, "-search=", 8) == 0)
key = arg + 8;
else if (strncmp(arg, "-precision=", 11) == 0)
fmt.precision = atoi(arg + 11);
else if (arg[0] == '-')
usage(progname, stderr, 1);
else
break;
}
if (file) {
struct stat st;
int fd;
ssize_t n;
if (argc != 0)
usage(progname, stderr, 1);
fd = open(file, O_RDONLY);
if (fd == -1) {
perror(file);
return 2;
}
if (fstat(fd, &st)) {
perror("fstat");
return 2;
}
size = (size_t) st.st_size;
if (size != st.st_size)
abort();
input = grecs_malloc(size + 1);
n = read(fd, input, size);
if (n == -1) {
perror("read");
return 2;
}
if (n != size) {
fprintf(stderr, "%s: short read from %s\n",
progname, file);
return 2;
}
input[n] = 0;
close(fd);
} else if (argc == 1) {
if (file)
usage(progname, stderr, 1);
input = *argv;
size = strlen(input);
} else
usage(progname, stderr, 1);
obj = json_parse_string(input, size);
if (!obj) {
json_err_locus.beg.file = json_err_locus.end.file =
file ? file : "input";
grecs_error(&json_err_locus, 0, "%s", json_err_diag);
return 3;
}
if (key) {
struct json_value *p = json_value_lookup(obj, key);
if (!p)
return 4;
obj = p;
}
fmt.data = stdout;
json_format_value(obj, &fmt);
putchar('\n');
return 0;
}
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