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/*-
* BSD LICENSE
*
* Copyright (c) Intel Corporation.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* * Neither the name of Intel Corporation nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/* Simple JSON "cat" utility */
#include "spdk/stdinc.h"
#include "spdk/json.h"
#include "spdk/file.h"
static void
usage(const char *prog)
{
printf("usage: %s [-c] [-f] file.json\n", prog);
printf("Options:\n");
printf("-c\tallow comments in input (non-standard)\n");
printf("-f\tformatted output (default: compact output)\n");
}
static void
print_json_error(FILE *pf, int rc, const char *filename)
{
switch (rc) {
case SPDK_JSON_PARSE_INVALID:
fprintf(pf, "%s: invalid JSON\n", filename);
break;
case SPDK_JSON_PARSE_INCOMPLETE:
fprintf(pf, "%s: incomplete JSON\n", filename);
break;
case SPDK_JSON_PARSE_MAX_DEPTH_EXCEEDED:
fprintf(pf, "%s: maximum nesting depth exceeded\n", filename);
break;
default:
fprintf(pf, "%s: unknown JSON parse error\n", filename);
break;
}
}
static int
json_write_cb(void *cb_ctx, const void *data, size_t size)
{
FILE *f = cb_ctx;
size_t rc;
rc = fwrite(data, 1, size, f);
return rc == size ? 0 : -1;
}
static int
process_file(const char *filename, FILE *f, uint32_t parse_flags, uint32_t write_flags)
{
size_t size;
void *buf, *end;
ssize_t rc;
struct spdk_json_val *values;
size_t num_values;
struct spdk_json_write_ctx *w;
buf = spdk_posix_file_load(f, &size);
if (buf == NULL) {
fprintf(stderr, "%s: file read error\n", filename);
return 1;
}
rc = spdk_json_parse(buf, size, NULL, 0, NULL, parse_flags);
if (rc <= 0) {
print_json_error(stderr, rc, filename);
free(buf);
return 1;
}
num_values = (size_t)rc;
values = calloc(num_values, sizeof(*values));
if (values == NULL) {
perror("values calloc");
free(buf);
return 1;
}
rc = spdk_json_parse(buf, size, values, num_values, &end,
parse_flags | SPDK_JSON_PARSE_FLAG_DECODE_IN_PLACE);
if (rc <= 0) {
print_json_error(stderr, rc, filename);
free(values);
free(buf);
return 1;
}
w = spdk_json_write_begin(json_write_cb, stdout, write_flags);
if (w == NULL) {
fprintf(stderr, "json_write_begin failed\n");
free(values);
free(buf);
return 1;
}
spdk_json_write_val(w, values);
spdk_json_write_end(w);
printf("\n");
if (end != buf + size) {
fprintf(stderr, "%s: garbage at end of file\n", filename);
free(values);
free(buf);
return 1;
}
free(values);
free(buf);
return 0;
}
int
main(int argc, char **argv)
{
FILE *f;
int ch;
int rc;
uint32_t parse_flags = 0, write_flags = 0;
const char *filename;
while ((ch = getopt(argc, argv, "cf")) != -1) {
switch (ch) {
case 'c':
parse_flags |= SPDK_JSON_PARSE_FLAG_ALLOW_COMMENTS;
break;
case 'f':
write_flags |= SPDK_JSON_WRITE_FLAG_FORMATTED;
break;
default:
usage(argv[0]);
return 1;
}
}
if (optind == argc) {
filename = "-";
} else if (optind == argc - 1) {
filename = argv[optind];
} else {
usage(argv[0]);
return 1;
}
if (strcmp(filename, "-") == 0) {
f = stdin;
} else {
f = fopen(filename, "r");
if (f == NULL) {
perror("fopen");
return 1;
}
}
rc = process_file(filename, f, parse_flags, write_flags);
if (f != stdin) {
fclose(f);
}
return rc;
}
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