Projects : keksum : keksum_genesis_3
| 1 | /* Minimalist POSIX I/O (unbuffered, dies on error) |
| 2 | * J. Welsh, May 2019 |
| 3 | */ |
| 4 | |
| 5 | #include <errno.h> |
| 6 | #include <signal.h> |
| 7 | #include <string.h> |
| 8 | #include <unistd.h> |
| 9 | #include "io.h" |
| 10 | |
| 11 | void write_all(int fd, char const *buf, size_t len) { |
| 12 | while (len) { |
| 13 | ssize_t n = write(fd,buf,len); |
| 14 | if (n < 0) { |
| 15 | if (errno == EINTR) continue; |
| 16 | if (fd != 2) /* prevent loop */ |
| 17 | perr("write_all"); |
| 18 | _exit(errno); |
| 19 | } |
| 20 | buf += n; |
| 21 | len -= n; |
| 22 | } |
| 23 | } |
| 24 | |
| 25 | size_t read_all(int fd, unsigned char *buf, size_t len) { |
| 26 | size_t olen = len; |
| 27 | while (len) { |
| 28 | ssize_t n = read(fd,buf,len); |
| 29 | if (n <= 0) { |
| 30 | if (n) { |
| 31 | if (errno == EINTR) continue; |
| 32 | perr("read_all"); |
| 33 | _exit(errno); |
| 34 | } |
| 35 | break; |
| 36 | } |
| 37 | buf += n; |
| 38 | len -= n; |
| 39 | } |
| 40 | return olen - len; |
| 41 | } |
| 42 | |
| 43 | void write_str(int fd, char const *s) { |
| 44 | write_all(fd,s,strlen(s)); |
| 45 | } |
| 46 | |
| 47 | void newline(int fd) { |
| 48 | write_all(fd,"\n",1); |
| 49 | } |
| 50 | |
| 51 | void write_line(int fd, char const *s) { |
| 52 | write_str(fd,s); |
| 53 | newline(fd); |
| 54 | } |
| 55 | |
| 56 | void assert_fail(char const *expr) { |
| 57 | write_str(2,"Assertion failed: "); |
| 58 | write_line(2,expr); |
| 59 | raise(SIGABRT); |
| 60 | _exit(1); |
| 61 | } |
| 62 | |
| 63 | void perr(char const *context) { |
| 64 | write_str(2,context); |
| 65 | write_str(2,": "); |
| 66 | write_line(2,strerror(errno)); |
| 67 | } |
| 68 | |
| 69 | int chkp(char const *context, int ret) { |
| 70 | if (ret == -1) { |
| 71 | perr(context); |
| 72 | _exit(errno); |
| 73 | } |
| 74 | return ret; |
| 75 | } |