^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /* Parse JSON files using the JSMN parser. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2014, Intel Corporation
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) * Redistribution and use in source and binary forms, with or without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * modification, are permitted provided that the following conditions are met:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * 1. Redistributions of source code must retain the above copyright notice,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * this list of conditions and the following disclaimer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * 2. Redistributions in binary form must reproduce the above copyright
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * notice, this list of conditions and the following disclaimer in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * documentation and/or other materials provided with the distribution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * OF THE POSSIBILITY OF SUCH DAMAGE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) #include <stdlib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) #include <string.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) #include <sys/mman.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) #include <sys/stat.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) #include <fcntl.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) #include <stdio.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include <errno.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include <unistd.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include "jsmn.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) #include "json.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) #include <linux/kernel.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) static char *mapfile(const char *fn, size_t *size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) unsigned ps = sysconf(_SC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) struct stat st;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) char *map = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) int fd = open(fn, O_RDONLY);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) if (fd < 0 && verbose > 0 && fn) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) pr_err("Error opening events file '%s': %s\n", fn,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) strerror(errno));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) if (fd < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) err = fstat(fd, &st);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) if (err < 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) goto out;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) *size = st.st_size;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) map = mmap(NULL,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) (st.st_size + ps - 1) & ~(ps - 1),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) if (map == MAP_FAILED)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) map = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) out:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) close(fd);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) return map;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) static void unmapfile(char *map, size_t size)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) unsigned ps = sysconf(_SC_PAGESIZE);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) munmap(map, roundup(size, ps));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) * Parse json file using jsmn. Return array of tokens,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) * and mapped file. Caller needs to free array.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) jsmntok_t *parse_json(const char *fn, char **map, size_t *size, int *len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) jsmn_parser parser;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) jsmntok_t *tokens;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) jsmnerr_t res;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) unsigned sz;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) *map = mapfile(fn, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) if (!*map)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) /* Heuristic */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) sz = *size * 16;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) tokens = malloc(sz);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) if (!tokens)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) goto error;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) jsmn_init(&parser);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) res = jsmn_parse(&parser, *map, *size, tokens,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100) sz / sizeof(jsmntok_t));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) if (res != JSMN_SUCCESS) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) pr_err("%s: json error %s\n", fn, jsmn_strerror(res));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) goto error_free;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) if (len)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) *len = parser.toknext;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) return tokens;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) error_free:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) free(tokens);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) error:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) unmapfile(*map, *size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) return NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) void free_json(char *map, size_t size, jsmntok_t *tokens)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) free(tokens);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) unmapfile(map, size);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) static int countchar(char *map, char c, int end)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) int i;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) int count = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) for (i = 0; i < end; i++)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) if (map[i] == c)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) count++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) return count;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) /* Return line number of a jsmn token */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) int json_line(char *map, jsmntok_t *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) return countchar(map, '\n', t->start) + 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) static const char * const jsmn_types[] = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) [JSMN_PRIMITIVE] = "primitive",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) [JSMN_ARRAY] = "array",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) [JSMN_OBJECT] = "object",
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) [JSMN_STRING] = "string"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) #define LOOKUP(a, i) ((i) < (sizeof(a)/sizeof(*(a))) ? ((a)[i]) : "?")
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) /* Return type name of a jsmn token */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) const char *json_name(jsmntok_t *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) return LOOKUP(jsmn_types, t->type);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) int json_len(jsmntok_t *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) return t->end - t->start;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* Is string t equal to s? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) int json_streq(char *map, jsmntok_t *t, const char *s)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) unsigned len = json_len(t);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) return len == strlen(s) && !strncasecmp(map + t->start, s, len);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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