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AdrianSkar/main.c

Last active June 20, 2024 14:09
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[GNL]: main for printf segfault on EOF
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main.c
#include "get_next_line.h"
#include <stdio.h> // printf
#include <fcntl.h> // open, O_RDONLY, O_WRONLY, O_RDWR,
int main(void)
{
int gnl_calls = 3, fd, i;
char *line;
fd = open("test.txt", O_RDONLY);
if (fd == -1)
{
perror("Error opening file");
return 1;
}
while(gnl_calls-- > 0)
{
line = get_next_line(fd);
printf("%s\n", line); //! printf segfaults if EOF is reached
printf(" %s\n", line); //* Doesn't segfault
printf("%s \n", line); //* Doesn't segfault
printf("%s\n ", line); //* Doesn't segfault
printf("%s\t", line); //* Doesn't segfault
free(line);
}
close(fd);
return (0);
}
@AdrianSkar
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It's because of gcc when compiling and how it behaves with %s + NULL. Doesn't happen on either cc or clang.

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