Hello, I have written a program in c which searches for a string in a text file. The program works, however I get a 'segmentation fault' error after the program terminates. I believe I have tracked the problem down to the while loop inside function Read(). Any help is much appreciated. Thanks, -------------------------------------------------------------------------- Code: #include <stdio.h> #include <string.h> /* Declare static maximum array size */ const int MAX_INPUT_SIZE = 60000; /************************************************** ************* Task: Read text file and search for string Implementation: Asks the user to input a string they would like to search for, and loads each string array 'index' with a line from the file using strstr(). The program searches for the user's string as each line is read. The program then notifies the user of the results. ************************************************** **************/ void Read(FILE* file) { char* _string; char token[MAX_INPUT_SIZE]; int count = 0; printf("\nString to search for: "); fflush(stdout); fgets(token, 10, stdin); if (token[strlen(token) - 1] == '\n') { token[strlen(token) - 1] = '\0'; } // End if while (fgets(_string, 1024, file) != NULL) { if (strstr(_string, token) != NULL) count++; _string = _string + 1; } /* End while */ if (count != 0) printf("\nSuccess!!!\n\nString found: %d times\n\n", count); else printf("\nString not found\n\n"); } /* End read */ /************************************************** ************* Task: Program entry point main() Implementation: main asks the user to input a file for reading. Afterwards it calls function Read() to search for a string. ************************************************** **************/ int main(int argc, char *argv[]) { FILE * doc; char filename[50]; printf("\nFile to open: "); fgets(filename, 50000, stdin); /* Ensures the file name has no return characters */ if (filename[strlen(filename) - 1] == '\n') { filename[strlen(filename) - 1] = '\0'; } // End if /* Open file */ doc = fopen(filename, "r"); if (!doc) { printf("\nFile not found!\n"); exit(1); } // End if /* With file opened, call function to read file */ Read(doc); fclose(doc); return 0; } /* end main */
