Cannot understand why program crashes after a couple iterations of while loop? - c

Question

I am writing the following program to parse the text file (attached) but it keeps crashing after couple of iterations of while loop or it seems that the buffer storing file contents is corrupted somehow?
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
char * pick_question(char *, char, int);
char * print_answer(char *, char, int);
int no_of_questions(char*, char);
void clear();
int debug = 0;
int main(int argc, char* argv[])
{
system("cmd /c chcp 1252");
// system("cmd /c chcp 65001");
if (argc < 2)
{
perror("Please enter a filename!\n");
exit(0);
}
if (argc > 2)
{
debug = atoi(argv[2]);
}
char const* const fileName = argv[1];
FILE* file = fopen(fileName, "r");
if (!file)
{
perror("Unable to read file!\n");
exit(0);
}
else
{
if (debug == 1)
{
printf("File opened successfully\n");
}
}
static char *buffer;
int fileSz;
fseek(file, 0, SEEK_END);
fileSz = ftell(file);
fseek(file, 0, SEEK_SET);
buffer = (char*) malloc((fileSz + 1) * sizeof(char));
if (!buffer)
{
perror("Unable to allocate buffer!");
exit(0);
}
fread(buffer, sizeof(char), fileSz, file);
while (1)
{
time_t t;
srand((unsigned) time(&t));
int sub = rand() % 5 + 1;
char del;
switch (sub)
{
case 1:
del = 'A';
break;
case 2:
del = 'B';
break;
case 3:
del = 'C';
break;
case 4:
del = 'D';
break;
case 5:
del = 'E';
}
int nrOfQues = no_of_questions(buffer, del);
if (nrOfQues == 0)
{
perror("main(): no_of_questions() returned 0. Unsupported text structure in file or incorrect file encoding!");
fclose(file);
exit(0);
}
int qNo = rand() % nrOfQues + 1;
char *ques = pick_question(buffer, del, qNo);
if (ques)
{
printf("\n\n");
puts(ques);
printf("\n\n");
}
else
{
perror("main(): pick_question() returned NULL. Unsupported text structure in file!");
fclose(file);
exit(0);
}
printf("\n\n");
printf("Do you want to see the answer(y/n)?");
char ans, repeat;
scanf("%c", &ans);
if ( ans == 'Y' || ans == 'y')
{
char *ans = print_answer(buffer, del, qNo);
if (ans)
{
printf("\n\n");
puts(ans);
printf("\n\n");
}
else
{
printf("\n\n");
perror("main(): print_answer() returned NULL. Unsupported text structure in file!");
fclose(file);
exit(0);
}
}
printf("Do you want to try more questions (y/n)?");
clear();
scanf("%c", &repeat);
if (repeat == 'N' || repeat == 'n')
{
break;
}
clear();
}
printf("\n\n");
printf("******** Thank you for using TULE Master! ********");
printf("\n\n");
fclose(file);
return 0;
}
char * pick_question(char * buffer, char sub, int qNo)
{
char tmpBuff[20];
char tmpBuff2[20];
const char * searchStr = "FRÅGA";
const char * searchStr2 = "A 1 SVAR:";
const char * searchStr3 = "*****************************************";
char *pStr, *currPos, *nStr, *tmpStr, *tmpStr2;
currPos = buffer;
int count = snprintf(tmpBuff, 20, "FRÅGA %c %d", sub, qNo);
if (count >= 0 || count < 20)
{
if (debug)
{
printf("tmpBuff is %s\n", tmpBuff);
}
currPos = strstr(currPos, tmpBuff);
if (currPos)
{
pStr = currPos;
nStr = currPos + 1;
nStr = strstr(nStr, searchStr);
if (!nStr)
{
nStr = currPos;
nStr = strstr(nStr, searchStr2);
if (!nStr)
{
printf("pick_qestion(): nStr is NULL. Unsupported "
"text structure");
return NULL;
}
}
// Check if it is a scenario based question
count = snprintf(tmpBuff2, 20, "FRÅGA %c %d", sub, qNo-1);
if (count >= 0 || count < 20)
{
tmpStr = strstr(buffer, tmpBuff2);
tmpStr2 = strstr(tmpStr, searchStr3);
if (tmpStr < tmpStr2 && tmpStr2 < pStr)
{
pStr = tmpStr2;
}
}
int qLen = nStr - pStr;
char *ques = malloc(sizeof(char) * (qLen+1));
snprintf(ques,qLen,"%s", pStr);
return ques;
}
else
{
printf("pick_qestion(): string \"FRÅGA\" not found in file!");
return NULL;
}
}
printf("pick_qestion(): snprintf was not successful!");
return NULL;
}
char * print_answer(char * buffer, char sub, int qNo)
{
char tmpBuff[20];
char *pStr, *currPos, *nStr;
int count = snprintf(tmpBuff, 20, "%c %d SVAR:", sub, qNo);
if (count >= 0 || count < 20)
{
currPos = strstr(buffer, tmpBuff);
if (!currPos)
{
printf("print_answer(): string \"SVAR\" not found in file!");
}
pStr = currPos;
nStr = currPos + 1;
char tmpBuff2[20];
int count = snprintf(tmpBuff2, 20, "%c %d SVAR:", sub, qNo+1);
if (count < 0 || count >= 20)
{
printf("print_answer(): snprint was not successful!");
return NULL;
}
nStr = strstr(nStr, tmpBuff2);
if (!nStr)
{
nStr = buffer + strlen(buffer);
}
int ansLen = nStr - pStr;
char *ans = malloc(sizeof(char) * (ansLen+1));
snprintf(ans, ansLen, "%s", pStr);
return ans;
}
printf("print_answer(): snprint was not successful!");
return NULL;
}
int no_of_questions(char *buffer, char sub)
{
char tmpBuff[20];
char *currPos, *pStr;
int count = snprintf(tmpBuff, 20, "FRÅGA %c", sub);
if (count >= 0 || count < 20)
{
if (debug)
{
printf("tmpBuff is %s\n", tmpBuff);
}
currPos = strstr(buffer, tmpBuff);
while (currPos != NULL)
{
pStr = currPos;
currPos = currPos + 1;
currPos = strstr(currPos, tmpBuff);
}
if (pStr != buffer)
{
pStr += 9;
char tmpBuff2[20];
memcpy(tmpBuff2, pStr, 2);
if (debug)
{
printf("No. of questions for %c DEL is are %d\n", sub,
atoi(tmpBuff2));
}
return atoi(tmpBuff2);
}
return 0;
}
return 0;
}
void clear()
{
int c;
while ((c = getchar()) != '\n' && c != EOF) { }
}
This is the file that is given as input to the program:
Link