Segmentation fault (strings, pointers, Linux)

I was writing the program for what appeared a fairly simple problem: Print a string in reverse order using recursion. My code is as follows. The strange thing is that I get Segmentation Fault errors no matter what I do. Any help is greatly appreciated. I'm on Linux, by the way.

Code:

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/*
Reverse a string using recursion
*/
#include <stdio.h>

void rev_string(char *c)
{   
    if(*c != '\0')
    {
        rev_string(c++);
        printf("%c", *c);
    }
}

void get_line(char str[])
{
    int i=0;
    char c;
   
    while(c=getchar() != '\n')
    {   
        str[i++] = c;
    }
   
    str[i] = '\0';
}

int main()
{
    char str[100];
   
    get_line(str);
   
    rev_string(str);
       
    printf("\n");
    return 0;
}

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You are modifying the local copy of c (and passing on the old value!).
It should be

Code:

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    rev_string(c + 1);

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This is also wrong

Code:

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while(c=getchar() != '\n')

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it should be

Code:

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while((c=getchar()) != '\n')

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Otherwise c just gets 0 or 1 depending on whether getchar() returned '\n' or not.

Oh, wow! Thanks a lot! I didn't realize I was modifying the local variable. Phew! :)
Thank you very much, again. Is there a way for me to close this thread?