diff options
Diffstat (limited to 'server/file.c')
-rw-r--r-- | server/file.c | 65 |
1 files changed, 65 insertions, 0 deletions
diff --git a/server/file.c b/server/file.c new file mode 100644 index 0000000..26c3cd0 --- /dev/null +++ b/server/file.c @@ -0,0 +1,65 @@ +/* + * server/file.c + */ + + +#include <unistd.h> +#include <fcntl.h> +#include <errno.h> +#include "file.h" + + +int file_open(char *filename) +{ + int fd = open(filename, O_RDONLY); + if (fd == -1) + return -1; + + struct stat st; + if (fstat(fd, &st) == -1) + return -1; + + return fd; +} + + +int file_getsize(int fd, off_t *size) +{ + *size = lseek64(fd, 0, SEEK_END); + + if (*size == -1) + return -1; + + return 0; +} + + +int file_read(int fd, void *buf, size_t size, off_t pos) +{ + off_t newpos = lseek(fd, pos, SEEK_SET); + + if (newpos == -1) + return -1; + + size_t nleft = size; + ssize_t nread; + char *ptr = buf; + + while (nleft > 0) { + if ((nread = read(fd, ptr, nleft)) < 0) { + if (errno == EINTR) + continue; + + return -1; + } + + if (nread == 0) { + break; + } + + nleft -= nread; + ptr += nread; + } + + return 0; +} |