Getting Segmentation fault when trying to read a json file
I'm trying to parse a json file using jsmn but I get segmentation fault when I run my application. I'm using C and compiling on Ubuntu machine.
Please find the code snippet below:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "jsmn.h"
#define JSON_FILE_PATH "/home/admin/Desktop/test/server/dataFile.json"
#define BUFFER_SIZE 5000
#define MAX_TOKEN_COUNT 128
// Read files
void readfile(char* filepath, char* fileContent)
FILE *f;
char c;
int index;
f = fopen(filepath, "r");
***while((c = fgetc(f)) != EOF)*** ------> seg fault
fileContent[index] = c;
index++;
fileContent[index] = '';
// This is where the magic happens
int parseJSON(char *filepath, void callback(char *, char*))
// Only prints the key and value
void mycallback(char *key, char* value)
printf("%s : %sn", key, value);
int main()
parseJSON(JSON_FILE_PATH, mycallback);
return 0;
I get segmentation fault after the line as indicated when the file operation of reading is done.
On debugging, at this point f contains 0x00 value which means it is not able to identify the file.
Why this might be happening when file is present at that location?
I tried changing paths but still same issue.
c json linux ubuntu jsmn
edited Jan 8 at 5:14
Cœur
18.3k9108148
asked Nov 12 '18 at 4:57
user2156513user2156513
366
add a comment |
I'm trying to parse a json file using jsmn but I get segmentation fault when I run my application. I'm using C and compiling on Ubuntu machine.
Please find the code snippet below:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "jsmn.h"
#define JSON_FILE_PATH "/home/admin/Desktop/test/server/dataFile.json"
#define BUFFER_SIZE 5000
#define MAX_TOKEN_COUNT 128
// Read files
void readfile(char* filepath, char* fileContent)
FILE *f;
char c;
int index;
f = fopen(filepath, "r");
***while((c = fgetc(f)) != EOF)*** ------> seg fault
fileContent[index] = c;
index++;
fileContent[index] = '';
// This is where the magic happens
int parseJSON(char *filepath, void callback(char *, char*))
// Only prints the key and value
void mycallback(char *key, char* value)
printf("%s : %sn", key, value);
int main()
parseJSON(JSON_FILE_PATH, mycallback);
return 0;
I get segmentation fault after the line as indicated when the file operation of reading is done.
On debugging, at this point f contains 0x00 value which means it is not able to identify the file.
Why this might be happening when file is present at that location?
I tried changing paths but still same issue.
c json linux ubuntu jsmn
edited Jan 8 at 5:14
Cœur
18.3k9108148
asked Nov 12 '18 at 4:57
user2156513user2156513
366
2
indexis not initialized before use. UB.
– babon
Nov 12 '18 at 4:59
4
char cshould beint c-fgetcreturns anint
– Rishikesh Raje
Nov 12 '18 at 5:00
thankyou for the help..It is working now !!
– user2156513
Nov 12 '18 at 5:09
@user2156513 So, in that case, write an answer for your own question and mark it as accepted. This way, in future other people searching for the same problem will get a solution.
– Sourav Ghosh
Nov 12 '18 at 5:14
add a comment |
I'm trying to parse a json file using jsmn but I get segmentation fault when I run my application. I'm using C and compiling on Ubuntu machine.
Please find the code snippet below:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "jsmn.h"
#define JSON_FILE_PATH "/home/admin/Desktop/test/server/dataFile.json"
#define BUFFER_SIZE 5000
#define MAX_TOKEN_COUNT 128
// Read files
void readfile(char* filepath, char* fileContent)
FILE *f;
char c;
int index;
f = fopen(filepath, "r");
***while((c = fgetc(f)) != EOF)*** ------> seg fault
fileContent[index] = c;
index++;
fileContent[index] = '';
// This is where the magic happens
int parseJSON(char *filepath, void callback(char *, char*))
// Only prints the key and value
void mycallback(char *key, char* value)
printf("%s : %sn", key, value);
int main()
parseJSON(JSON_FILE_PATH, mycallback);
return 0;
I get segmentation fault after the line as indicated when the file operation of reading is done.
On debugging, at this point f contains 0x00 value which means it is not able to identify the file.
Why this might be happening when file is present at that location?
I tried changing paths but still same issue.
c json linux ubuntu jsmn
edited Jan 8 at 5:14
Cœur
18.3k9108148
asked Nov 12 '18 at 4:57
user2156513user2156513
366
I'm trying to parse a json file using jsmn but I get segmentation fault when I run my application. I'm using C and compiling on Ubuntu machine.
Please find the code snippet below:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "jsmn.h"
#define JSON_FILE_PATH "/home/admin/Desktop/test/server/dataFile.json"
#define BUFFER_SIZE 5000
#define MAX_TOKEN_COUNT 128
// Read files
void readfile(char* filepath, char* fileContent)
FILE *f;
char c;
int index;
f = fopen(filepath, "r");
***while((c = fgetc(f)) != EOF)*** ------> seg fault
fileContent[index] = c;
index++;
fileContent[index] = '';
// This is where the magic happens
int parseJSON(char *filepath, void callback(char *, char*))
// Only prints the key and value
void mycallback(char *key, char* value)
printf("%s : %sn", key, value);
int main()
parseJSON(JSON_FILE_PATH, mycallback);
return 0;
I get segmentation fault after the line as indicated when the file operation of reading is done.
On debugging, at this point f contains 0x00 value which means it is not able to identify the file.
Why this might be happening when file is present at that location?
I tried changing paths but still same issue.
c json linux ubuntu jsmn
c json linux ubuntu jsmn
edited Jan 8 at 5:14
Cœur
18.3k9108148
asked Nov 12 '18 at 4:57
user2156513user2156513
366
edited Jan 8 at 5:14
Cœur
18.3k9108148
asked Nov 12 '18 at 4:57
user2156513user2156513
366
edited Jan 8 at 5:14
Cœur
18.3k9108148
edited Jan 8 at 5:14
Cœur
18.3k9108148
edited Jan 8 at 5:14
Cœur
18.3k9108148
18.3k9108148
asked Nov 12 '18 at 4:57
user2156513user2156513
366
asked Nov 12 '18 at 4:57
user2156513user2156513
366
asked Nov 12 '18 at 4:57
user2156513user2156513
366
366
2
indexis not initialized before use. UB.
– babon
Nov 12 '18 at 4:59
4
char cshould beint c-fgetcreturns anint
– Rishikesh Raje
Nov 12 '18 at 5:00
thankyou for the help..It is working now !!
– user2156513
Nov 12 '18 at 5:09
@user2156513 So, in that case, write an answer for your own question and mark it as accepted. This way, in future other people searching for the same problem will get a solution.
– Sourav Ghosh
Nov 12 '18 at 5:14
add a comment |
2
indexis not initialized before use. UB.
– babon
Nov 12 '18 at 4:59
4
char cshould beint c-fgetcreturns anint
– Rishikesh Raje
Nov 12 '18 at 5:00
thankyou for the help..It is working now !!
– user2156513
Nov 12 '18 at 5:09
@user2156513 So, in that case, write an answer for your own question and mark it as accepted. This way, in future other people searching for the same problem will get a solution.
– Sourav Ghosh
Nov 12 '18 at 5:14
2
2
index is not initialized before use. UB.– babon
Nov 12 '18 at 4:59
index is not initialized before use. UB.– babon
Nov 12 '18 at 4:59
4
4
char c should be int c - fgetc returns an int– Rishikesh Raje
Nov 12 '18 at 5:00
char c should be int c - fgetc returns an int– Rishikesh Raje
Nov 12 '18 at 5:00
thankyou for the help..It is working now !!
– user2156513
Nov 12 '18 at 5:09
thankyou for the help..It is working now !!
– user2156513
Nov 12 '18 at 5:09
@user2156513 So, in that case, write an answer for your own question and mark it as accepted. This way, in future other people searching for the same problem will get a solution.
– Sourav Ghosh
Nov 12 '18 at 5:14
@user2156513 So, in that case, write an answer for your own question and mark it as accepted. This way, in future other people searching for the same problem will get a solution.
– Sourav Ghosh
Nov 12 '18 at 5:14
add a comment |
1 Answer
1
active
oldest
votes
Found the solution:
index is not initialized before use
char c should be int c - fgetc returns an int
answered Nov 12 '18 at 5:22
user2156513user2156513
366
For large files, suggestint index;-->size_t index = 0;
– chux
Nov 12 '18 at 7:10
add a comment |
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1 Answer
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1 Answer
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active
oldest
votes
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oldest
votes
active
oldest
votes
Found the solution:
index is not initialized before use
char c should be int c - fgetc returns an int
answered Nov 12 '18 at 5:22
user2156513user2156513
366
For large files, suggestint index;-->size_t index = 0;
– chux
Nov 12 '18 at 7:10
add a comment |
Found the solution:
index is not initialized before use
char c should be int c - fgetc returns an int
answered Nov 12 '18 at 5:22
user2156513user2156513
366
For large files, suggestint index;-->size_t index = 0;
– chux
Nov 12 '18 at 7:10
add a comment |
Found the solution:
index is not initialized before use
char c should be int c - fgetc returns an int
answered Nov 12 '18 at 5:22
user2156513user2156513
366
Found the solution:
index is not initialized before use
char c should be int c - fgetc returns an int
answered Nov 12 '18 at 5:22
user2156513user2156513
366
answered Nov 12 '18 at 5:22
user2156513user2156513
366
answered Nov 12 '18 at 5:22
user2156513user2156513
366
answered Nov 12 '18 at 5:22
user2156513user2156513
366
366
For large files, suggestint index;-->size_t index = 0;
– chux
Nov 12 '18 at 7:10
add a comment |
For large files, suggestint index;-->size_t index = 0;
– chux
Nov 12 '18 at 7:10
For large files, suggest
int index; --> size_t index = 0;– chux
Nov 12 '18 at 7:10
For large files, suggest
int index; --> size_t index = 0;– chux
Nov 12 '18 at 7:10
add a comment |
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2
indexis not initialized before use. UB.– babon
Nov 12 '18 at 4:59
4
char cshould beint c-fgetcreturns anint– Rishikesh Raje
Nov 12 '18 at 5:00
thankyou for the help..It is working now !!
– user2156513
Nov 12 '18 at 5:09
@user2156513 So, in that case, write an answer for your own question and mark it as accepted. This way, in future other people searching for the same problem will get a solution.
– Sourav Ghosh
Nov 12 '18 at 5:14