Get one string with space first and get another after tabs - c

Question

I want to get strings from a .txt file, reading lines that each has name and phone number. and two \t characters are between names and phone numbers.
Example:
name\t\t\tphone#
thomas jefferson\t\t054-892-5882
bill clinton\t\t054-518-6974
The code is like this;
FILE *f;
errno_t err;
treeNode *tree = NULL, temp;
char input, fileName[100];
//get file name
while (1){
printf("Enter input file name: ");
scanf_s("%s", fileName, 100);
//f = fopen(fileName, "r");
if(err = fopen_s(&f, fileName, "r"))
printf("Cannot find file!\n");
//if (f == NULL)
// printf("Cannot find file!\n");
else
break;
}
//save info into BST
fscanf_s(f, " NAME Phone #\n", 20);
while (fscanf_s(f, "%[^\t]s\t\t%[^\n]s",
temp.name, temp.phoneNo, 50, 30) != EOF)
bstInsert(tree, temp.name, temp.phoneNo);
fclose(f);
treeNode is a binary search tree struct, and bstInsert is a function to add a struct containing 2nd and 3rd parameters to a binary search tree.
after I get the name of the file with scanf_s, code stops at the fscanf_s statement, showing below on the debugger;
temp.name: invalid characters in string.
temp.phoneNo: ""
I don't know how [^\t] or [^\n] works exactly. Can anyone let me know how I can deal with this problem? Thanks in advance!

Answer 1

"Can anyone let me know how can I deal with this problem?" I am no fan of scanf and family, so I deal with the problem by using different methods. Following your lead of using fopen_s and scanf_s I have used the "safer" version of strtok which is strtok_s.
#include <stdio.h>
#include <string.h>
int main (void) {
FILE *f;
errno_t err;
char *pName, *pPhone;
char input[100], fileName[100];
char *next_token = NULL;
// get file name
do{
printf("Enter input file name: ");
scanf_s("%s", fileName, 100);
if(err = fopen_s(&f, fileName, "r"))
printf("Cannot find file!\n");
} while (err);
// read and process each line of the file
while(NULL != fgets(input, 100, f)) { // has trailing newline
// isolate name
pName = strtok_s(input, "\t\r\n", &next_token); // strip newline too
if (pName == NULL) // garbage trap
pName = "(Error)";
printf ("%-30s", pName);
// isolate phone number
pPhone = strtok_s(NULL, "\t\r\n", &next_token); // arg is NULL after initial call
if (pPhone == NULL)
pPhone = "(Error)";
printf ("%s", pPhone);
printf ("\n");
}
fclose(f);
return 0;
}
Program output using a file with your example data:
Enter input file name: test.txt
name phone#
thomas jefferson 054-892-5882
bill clinton 054-518-6974