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read_line.c
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read_line.c
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#include "shell_head.h"
#define PROMPT_SIZE 4
#define BUFF_SIZE 5
/* this function reads commands the user types into marcel_the_shell */
char *read_line(int fd)
{
char *bf, *temp;
int size, i;
char prompt[] = ">>> ";
write(1, prompt, PROMPT_SIZE);
bf = malloc(sizeof(char) * (BUFF_SIZE));
i = 0;
while (1) {
size = read(fd, &(bf[i]), BUFF_SIZE);
if (size == -1) {
free(bf);
perror("read bad");
return NULL;
}
if (bf[i + size - 1] == '\n') {
bf[i + size - 1] = '\0';
return (bf);
}
i += size;
temp = malloc(sizeof(char) * (i));
copy_string(bf, temp, i);
free(bf);
bf = malloc(sizeof(char) * (i + BUFF_SIZE + 1));
copy_string(temp, bf, i);
free(temp);
}
}
/* makes a copy of a string -
* copies each element in array from source
* string to dest string
*/
void copy_string(char *source, char *dest, int n)
{
int i;
for (i = 0; i < n; i++) {
dest[i] = source[i];
}
}