jasmine.c

jasmine.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "jsmn.h"

/*
 * A small example of jsmn parsing when JSON structure is known and number of
 * tokens is predictable.
 */

static const char *JSON_STRING =
    "{\"user\": \"johndoe\", \"admin\": false, \"uid\": 1000,\n  "
    "\"groups\": [\"users\", \"wheel\", \"audio\", \"video\"]}";

static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
    if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
            strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
        return 0;
    }
    return -1;
}

int main() {
    int i;
    int r;
    jsmn_parser p;
    jsmntok_t t[128]; /* We expect no more than 128 tokens */

    jsmn_init(&p);
    r = jsmn_parse(&p, JSON_STRING, strlen(JSON_STRING), t, sizeof(t)/sizeof(t[0]));
    if (r < 0) {
        printf("Failed to parse JSON: %d\n", r);
        return 1;
    }

    /* Assume the top-level element is an object */
    if (r < 1 || t[0].type != JSMN_OBJECT) {
        printf("Object expected\n");
        return 1;
    }

    /* Loop over all keys of the root object */
    for (i = 1; i < r; i++) {
        if (jsoneq(JSON_STRING, &t[i], "user") == 0) {
            printf("USER KEY: %.*s",t[i].end - t[i].start ,JSON_STRING + t[i].start);
            printf("USER KEY");

            /* We may use strndup() to fetch string value */
            printf("- User: %.*s\n", t[i+1].end-t[i+1].start,
                    JSON_STRING + t[i+1].start);
            i++;
        } else if (jsoneq(JSON_STRING, &t[i], "admin") == 0) {
            /* We may additionally check if the value is either "true" or "false" */
            printf("- Admin: %.*s\n", t[i+1].end-t[i+1].start,
                    JSON_STRING + t[i+1].start);
            i++;
        } else if (jsoneq(JSON_STRING, &t[i], "uid") == 0) {
            /* We may want to do strtol() here to get numeric value */
            printf("- UID: %.s*\n", t[i+1].end-t[i+1].start,
                    JSON_STRING + t[i+1].start);
            printf("Waiting for the end\n");
            printf("C: %s\n", JSON_STRING + t[i+1].start);
            i++;
        } else if (jsoneq(JSON_STRING, &t[i], "groups") == 0) {
            int j;
            printf("- Groups:\n");
            if (t[i+1].type != JSMN_ARRAY) {
                continue; /* We expect groups to be an array of strings */
            }
            for (j = 0; j < t[i+1].size; j++) {
                jsmntok_t *g = &t[i+j+2];
                printf("  * %.*s\n", g->end - g->start, JSON_STRING + g->start);
                printf("END: %d\n", g->end);
                printf("START: %d\n", g->start);


                int str_length = g->end - g->start + 1;
                char strng[str_length + 1];
                int y = 0;
                for (y = 0; y < str_length - 1; y++){
                    strng[y] = JSON_STRING[g->start + y];
                }
                strng[str_length-1] = '\0';

                printf("COPIED STRING: %s\n", strng);
//                printf("STRING: %s");
//                printf("HELLO TOK\n");
            }
            i += t[i+1].size + 1;
        } else {
            printf("Unexpected key: %.*s\n", t[i].end-t[i].start,
                    JSON_STRING + t[i].start);
        }
    }
    printf ("Width trick: %*d \n", 5, 10);
    return EXIT_SUCCESS;
}

load_file_split_text.c

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "jsmn.h"

/*
 * A small example of jsmn parsing when JSON structure is known and number of
 * tokens is predictable.
 */

//static const char *JSON_STRING =
//    "{\"user\": \"johndoe\", \"admin\": false, \"uid\": 1000,\n  "
//    "\"groups\": [\"users\", \"wheel\", \"audio\", \"video\"]}";

static int jsoneq(const char *json, jsmntok_t *tok, const char *s) {
    if (tok->type == JSMN_STRING && (int) strlen(s) == tok->end - tok->start &&
            strncmp(json + tok->start, s, tok->end - tok->start) == 0) {
        return 0;
    }
    return -1;
}

int main() {
    char JSON_STRING[1024];
    printf("READING THE FILE\n");
    FILE *f;
    char c;
    f=fopen("/home/manash/Jsmn/JSON_STRING.json","rt");

    int index = 0;
    while((c=fgetc(f))!=EOF){
        JSON_STRING[index] = c;
//        printf("%c",c);
        index++;
    }
    JSON_STRING[index] = '\0';

    fclose(f);

    printf("The buffer itself\n");
    printf("%s", JSON_STRING);

    int i;
    int r;
    jsmn_parser p;
    jsmntok_t t[128]; /* We expect no more than 128 tokens */

    jsmn_init(&p);
    r = jsmn_parse(&p, JSON_STRING, strlen(JSON_STRING), t, sizeof(t)/sizeof(t[0]));
    if (r < 0) {
        printf("Failed to parse JSON: %d\n", r);
        return 1;
    }

    /* Assume the top-level element is an object */
    if (r < 1 || t[0].type != JSMN_OBJECT) {
        printf("Object expected\n");
        return 1;
    }

    /* Loop over all keys of the root object */
    for (i = 1; i < r; i++) {
        if (jsoneq(JSON_STRING, &t[i], "user") == 0) {
            printf("USER KEY: %.*s",t[i].end - t[i].start ,JSON_STRING + t[i].start);
            printf("USER KEY");

            /* We may use strndup() to fetch string value */
            printf("- User: %.*s\n", t[i+1].end-t[i+1].start,
                    JSON_STRING + t[i+1].start);
            i++;
        } else if (jsoneq(JSON_STRING, &t[i], "admin") == 0) {
            /* We may additionally check if the value is either "true" or "false" */
            printf("- Admin: %.*s\n", t[i+1].end-t[i+1].start,
                    JSON_STRING + t[i+1].start);
            i++;
        } else if (jsoneq(JSON_STRING, &t[i], "uid") == 0) {
            /* We may want to do strtol() here to get numeric value */
            printf("- UID: %.s*\n", t[i+1].end-t[i+1].start,
                    JSON_STRING + t[i+1].start);
            printf("Waiting for the end\n");
            printf("C: %s\n", JSON_STRING + t[i+1].start);
            i++;
        } else if (jsoneq(JSON_STRING, &t[i], "groups") == 0) {
            int j;
            printf("- Groups:\n");
            if (t[i+1].type != JSMN_ARRAY) {
                continue; /* We expect groups to be an array of strings */
            }
            for (j = 0; j < t[i+1].size; j++) {
                jsmntok_t *g = &t[i+j+2];
                printf("  * %.*s\n", g->end - g->start, JSON_STRING + g->start);
                printf("END: %d\n", g->end);
                printf("START: %d\n", g->start);


                int str_length = g->end - g->start + 1;
                char strng[str_length + 1];
                int y = 0;
                for (y = 0; y < str_length - 1; y++){
                    strng[y] = JSON_STRING[g->start + y];
                }
                strng[str_length-1] = '\0';

                printf("COPIED STRING: %s\n", strng);
//                printf("STRING: %s");
//                printf("HELLO TOK\n");
            }
            i += t[i+1].size + 1;
        } else {
            printf("Unexpected key: %.*s\n", t[i].end-t[i].start,
                    JSON_STRING + t[i].start);
        }
    }
    printf ("Width trick: %*d \n", 5, 10);
    return EXIT_SUCCESS;
}