| 1 | /* -*- |
| 2 | * |
| 3 | * Like cat, with datestamps |
| 4 | */ |
| 5 | |
| 6 | #include <errno.h> |
| 7 | #include <stdio.h> |
| 8 | #include <stdlib.h> |
| 9 | #include <string.h> |
| 10 | #include <time.h> |
| 11 | |
| 12 | #include <unistd.h> |
| 13 | |
| 14 | #include <mLib/mdwopt.h> |
| 15 | #include <mLib/quis.h> |
| 16 | #include <mLib/report.h> |
| 17 | |
| 18 | static const char *fmt = "%Y-%m-%d %H:%M:%S %Z: "; |
| 19 | static struct tm *(*cvt)(const time_t *) = localtime; |
| 20 | |
| 21 | static void version(void) { pquis(stdout, "$ " VERSION); } |
| 22 | static void usage(FILE *fp) |
| 23 | { pquis(fp, "Usage: $ [-z] [-f FORMAT] [FILE...]"); } |
| 24 | |
| 25 | static void help(void) |
| 26 | { |
| 27 | version(); putchar('\n'); |
| 28 | usage(stdout); |
| 29 | fputs("\n\ |
| 30 | Copy the FILEs (or standard input) to standard output, prefixing each line\n\ |
| 31 | with a datestamp.\n\ |
| 32 | \n\ |
| 33 | -h, --help Show this help text.\n\ |
| 34 | -v, --version Show the program's version number.\n\ |
| 35 | -u, --usage Show a brief usage message.\n\ |
| 36 | \n\ |
| 37 | -f, --format=FORMAT Write datestamps using the strftime(3) FORMAT.\n\ |
| 38 | -z, --utc, --zulu Use UTC rather than local time for datestamps.\n\ |
| 39 | ", stdout); |
| 40 | } |
| 41 | |
| 42 | static void cat(FILE *in) |
| 43 | { |
| 44 | unsigned ln = 1; |
| 45 | time_t t; |
| 46 | struct tm *tm; |
| 47 | char buf[256]; |
| 48 | int ch; |
| 49 | |
| 50 | for (;;) { |
| 51 | if ((ch = getc(in)) == EOF) |
| 52 | break; |
| 53 | if (ln) { |
| 54 | t = time(0); |
| 55 | tm = cvt(&t); |
| 56 | strftime(buf, sizeof(buf), fmt, tm); |
| 57 | fwrite(buf, 1, strlen(buf), stdout); |
| 58 | } |
| 59 | putchar(ch); |
| 60 | ln = (ch == '\n'); |
| 61 | } |
| 62 | if (!ln) |
| 63 | putchar('\n'); |
| 64 | } |
| 65 | |
| 66 | int main(int argc, char *argv[]) |
| 67 | { |
| 68 | int i; |
| 69 | FILE *fp; |
| 70 | unsigned f = 0; |
| 71 | #define F_BOGUS 1u |
| 72 | |
| 73 | ego(argv[0]); |
| 74 | setvbuf(stdin, 0, _IOLBF, 0); |
| 75 | |
| 76 | for (;;) { |
| 77 | static const struct option opt[] = { |
| 78 | { "help", 0, 0, 'h' }, |
| 79 | { "version", 0, 0, 'v' }, |
| 80 | { "usage", 0, 0, 'u' }, |
| 81 | { "format", OPTF_ARGREQ, 0, 'f' }, |
| 82 | { "utc", 0, 0, 'z' }, |
| 83 | { "zulu", 0, 0, 'z' }, |
| 84 | { 0, 0, 0, 0 } |
| 85 | }; |
| 86 | |
| 87 | if ((i = mdwopt(argc, argv, "hvuf:z", opt, 0, 0, 0)) < 0) |
| 88 | break; |
| 89 | switch (i) { |
| 90 | case 'h': |
| 91 | help(); |
| 92 | exit(0); |
| 93 | case 'v': |
| 94 | version(); |
| 95 | exit(0); |
| 96 | case 'u': |
| 97 | usage(stdout); |
| 98 | exit(0); |
| 99 | case 'f': |
| 100 | fmt = optarg; |
| 101 | break; |
| 102 | case 'z': |
| 103 | cvt = gmtime; |
| 104 | break; |
| 105 | default: |
| 106 | f |= F_BOGUS; |
| 107 | break; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | if (f & F_BOGUS) { |
| 112 | usage(stderr); |
| 113 | exit(EXIT_FAILURE); |
| 114 | } |
| 115 | |
| 116 | if (optind == argc) { |
| 117 | if (isatty(STDIN_FILENO)) |
| 118 | die(EXIT_FAILURE, "no arguments, and stdin is a terminal"); |
| 119 | cat(stdin); |
| 120 | } else for (i = optind; i < argc; i++) { |
| 121 | if (strcmp(argv[i], "-") == 0) |
| 122 | cat(stdin); |
| 123 | else if ((fp = fopen(argv[i], "r")) == 0) { |
| 124 | moan("failed to open `%s': %s", argv[i], strerror(errno)); |
| 125 | f |= F_BOGUS; |
| 126 | } else { |
| 127 | cat(fp); |
| 128 | fclose(fp); |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | if (ferror(stdout) || fflush(stdout) || fclose(stdout)) { |
| 133 | moan("error writing output: %s", strerror(errno)); |
| 134 | f |= F_BOGUS; |
| 135 | } |
| 136 | |
| 137 | return ((f & F_BOGUS) ? EXIT_FAILURE : 0); |
| 138 | } |