44 lines
920 B
C
44 lines
920 B
C
#include <sys/types.h>
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#include <unistd.h>
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#include "io.h"
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#ifdef unix
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struct pang_io {
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int fd;
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};
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ssize_t pang_write(struct pang_io *io, off_t offset, const void *buf, size_t count) {
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if (-1 == lseek(io->fd, offset, SEEK_SET))
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return -1;
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return write(io->fd, buf, count);
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}
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ssize_t pang_read(struct pang_io *io, off_t offset, void *buf, size_t count) {
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if (-1 == lseek(io->fd, offset, SEEK_SET))
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return -1;
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return read(io->fd, buf, count);
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}
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struct pang_io *pang_open(const char *pathname) {
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int fd = open(pathname, O_RDWR | O_TRUNC | O_CREAT, 0777);
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if (-1 == fd)
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return NULL;
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struct pang_io *io = malloc(sizeof(struct pang_io));
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io->fd = fd;
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return io;
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}
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int pang_close(struct pang_io **io) {
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if (!io)
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return -1;
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if (!*io)
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return -1;
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int ret = close((*io)->fd);
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free(*io);
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*io = NULL;
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return ret;
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}
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#endif |