Read string

I'm searching for a code to read a string in input. The length of the scring in unknow.
I've to use getchar and malloc or calloc......
it's like gets() but i don't find it where i can find?

You would pass this code the char* you created in your other function. See if you can figure out how it works, it is pretty basic.

Code:

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void getLine(char** message) {

        int ch, len = 0;

        while((ch = getchar()) != '\n') { //check for end of line
                *message = realloc(*message, len+1); //increase inputString by 1 char
                if(*message == NULL) {
                        puts("Error allocating memory");
                        exit(1);
                }
                (*message)[len++] = ch;
        }
        (*message)[len] = '\0'; //add end token
}

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> it's like gets() but i don't find it where i can find?
gets() doesn't allow you to read an unknown length of input.

It just does it, and so in the process is likely to trash an unknown amount of memory in the process.

If you really want to provide such a feature, then use fgets() and malloc()
Several ways of doing this were posted not too long ago.

Quote:

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Originally Posted by Salem

> it's like gets() but i don't find it where i can find?
gets() doesn't allow you to read an unknown length of input.

It just does it, and so in the process is likely to trash an unknown amount of memory in the process.

If you really want to provide such a feature, then use fgets() and malloc()
Several ways of doing this were posted not too long ago.

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Thanks
Can u tell me the thread? if u remember....

But i can't use fgets() i can only use getchar()

Gee, I wonder how hard "Search: Key Word(s): fgets, malloc ; Posts Made By: Salem " can possibly get....

Quote:

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Originally Posted by andyhunter

You would pass this code the char* you created in your other function. See if you can figure out how it works, it is pretty basic.

Code:

---

void getLine(char** message) {

    int ch, len = 0;

    while((ch = getchar()) != '\n') { //check for end of line
        *message = realloc(*message, len+1); //increase inputString by 1 char
        if(*message == NULL) {
            puts("Error allocating memory");
            exit(1);
        }
        (*message)[len++] = ch;
    }
    (*message)[len] = '\0'; //add end token
}

---

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Can i use this code without using Realloc?

Well yes you can, however the code Salem referred you to does the job a lot nicer I might say. So without further adue here is Salem's code slightly modified:

Code:

---

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

char* getLine(int);

int main(void) {
       
        char* myInput;

        printf("Enter a line of text:");
        myInput = getLine(0);
        printf("%s\n", myInput);

        return 0;
}
char* getLine(int size)
{
    char *s;
    int myChar;

    myChar= getchar();
    if( myChar == '\n' )
    {
        s = malloc( size + 1 );
                s[size] = '\0';
        }
    else
    {
        s = getLine( size + 1 );
        s[size] = myChar;
    }
       
        return s;
}

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Real nice Salem. I like it.

If you have questions ask.