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get_input.c
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get_input.c
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#ifndef _GET_INPUT_C
#define _GET_INPUT_C
#include "get_input.h"
// Driver
/*
int
main(int argc, char* argv[]){
struct user_input* input = (struct user_input*) malloc(sizeof(struct user_input));
memset(input, '\0', sizeof(struct user_input));
input->input = NULL;
input->length = 0;
if(!get_user_input(input)) {
printf("Input:\t'%s'\nLength:\t%d\n", input->input, input->length);
free(input->input);
input->input = NULL;
}
if (input->input != NULL)
free(input->input);
free(input);
char* u_input = NULL;
int length = 0, temp = 0;
printf("< ");
temp = get_line(&u_input, &length, stdin);
printf("Input:\t'%s'\nBuffer Length:\t%d\nInput Length:\t%d\n", u_input, length, temp);
free(u_input);
return 0;
}
*/
int
alloc_line(char** buffer, int* buffer_length, int new_length) {
char* new_buffer = realloc((*buffer), new_length);
if (!new_buffer)
return -1;
(*buffer) = new_buffer;
(*buffer_length) = new_length;
return 0;
}
int
get_line (char** buffer, int* buffer_length, FILE* fptr) {
if ((*buffer_length) <= 0) {
if (alloc_line(buffer, buffer_length, 2) == -1) {
return -1;
}
}
if (!(*buffer)) {
return -1;
}
char* buffer_ptr = (*buffer);
int new_length = (*buffer_length);
while (1) {
//char* read_chars = fgets(buffer_ptr, new_length, fptr);
if (fgets(buffer_ptr, new_length, fptr) == NULL)
return -1;
const size_t read_size = strlen(*buffer);
// check if end of file or end of input is newline char
if (feof(fptr) || *((*buffer) + read_size - 1) == '\n') {
// remove '\n' char from input
*((*buffer) + read_size - 1) = '\0';
// return full input string
return ((*buffer) + read_size - 1) - (*buffer);
}
new_length = (*buffer_length) + 1;
if (alloc_line(buffer, buffer_length, (*buffer_length) * 2))
return -1;
// adjust pointer to the end of the input chars currently
// stored in buffer
buffer_ptr = (*buffer) + (*buffer_length) - new_length;
}
}
int
get_user_input(struct user_input* user_input) {
int bufferSize = 0;
char* user_raw_input = NULL;
while (1){
printf("> ");
user_input->length = get_line(&user_raw_input, &bufferSize, stdin);
if (user_input->length == -1) {
perror("Error getting input: ");
return 1;
}
else { break; }
}
// Copy input from get_line into input struct
// + trailing null char (not included in userInput->length)
user_input->input = (char*) malloc(1 + user_input->length * sizeof(char));
if (user_input->input == NULL) {
perror("Error allocating input buffer: ");
return 1;
}
memset(user_input->input, '\0', user_input->length + 1);
memcpy(user_input->input, user_raw_input, user_input->length);
free(user_raw_input);
return 0;
}
#endif