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utils.c
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utils.c
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#include "pipex.h"
int error_handler(int argn, char **argv, int funcres)
{
if (funcres >= 0)
return (funcres);
ft_putstr_fd(ft_strrchr(argv[0], '/') + 1, 2);
ft_putstr_fd(": ", 2);
ft_putstr_fd(strerror(errno), 2);
if (!argn)
{
ft_putchar_fd('\n', 2);
exit(1);
}
ft_putstr_fd(": ", 2);
ft_putstr_fd(argv[argn], 2);
ft_putchar_fd('\n', 2);
exit(1);
}
int eraser(void **p)
{
size_t i;
i = arrsize((char **)p);
while (p[i])
free(p[i--]);
free(p);
return (1);
}
void mounter(int leftpfd[2], int rightpfd[2], int infd, char **argv)
{
int i;
if (leftpfd[0] == 0)
leftpfd[0] = infd;
if (!rightpfd[1])
{
i = 0;
while (argv[i])
i++;
rightpfd[1] = file_check(--i, argv, W_OK);
}
dup2(leftpfd[0], 0);
dup2(rightpfd[1], 1);
close(leftpfd[0]);
close(rightpfd[1]);
}
int arrsize(char **argv)
{
int size;
size = 0;
while (argv[size])
size++;
return (size);
}
int file_check(int argn, char **argv, int mod)
{
int fd;
fd = 0;
if (!access(argv[argn], F_OK) && !access(argv[argn], mod))
fd = open(argv[argn], O_RDWR);
if ((mod == R_OK && !fd) || (fd == -1 && errno == 21))
error_handler(argn, argv, -1);
if (mod == R_OK && ((fd > 0 && !close(fd)) || fd))
fd = error_handler(argn, argv, open(argv[argn], O_RDONLY));
if (mod == W_OK && ((fd > 0 && !close(fd)) || fd))
fd = open(argv[argn], O_WRONLY | O_TRUNC | O_APPEND);
else if (!fd)
fd = open(argv[argn], O_WRONLY | O_CREAT | O_EXCL | O_APPEND, 420);
if (!fd || fd == -1)
error_handler(argn, argv, -1);
return (fd);
}