projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| d14e89dc BJ |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | #include <stdio.h> | |
| 3 | #include <a.out.h> | |
| 4 | #include <ctype.h> | |
| 5 | ||
| 6 | long ftell(); | |
| 7 | ||
| 8 | /* | |
| 9 | * Strings - extract strings from an object file for whatever | |
| 10 | * | |
| 11 | * Bill Joy UCB | |
| 12 | * April 22, 1978 | |
| 13 | * | |
| 14 | * The algorithm is to look for sequences of "non-junk" characters | |
| 15 | * The variable "minlen" is the minimum length string printed. | |
| 16 | * This helps get rid of garbage. | |
| 17 | * Default minimum string length is 4 characters. | |
| 18 | */ | |
| 19 | ||
| 20 | struct exec header; | |
| 21 | ||
| 22 | char *infile = "Standard input"; | |
| 23 | int oflg; | |
| 24 | int asdata; | |
| 25 | long offset; | |
| 26 | int minlength = 4; | |
| 27 | ||
| 28 | main(argc, argv) | |
| 29 | int argc; | |
| 30 | char *argv[]; | |
| 31 | { | |
| 32 | ||
| 33 | argc--, argv++; | |
| 34 | while (argc > 0 && argv[0][0] == '-') { | |
| 35 | register int i; | |
| 36 | if (argv[0][1] == 0) | |
| 37 | asdata++; | |
| 38 | else for (i = 1; argv[0][i] != 0; i++) switch (argv[0][i]) { | |
| 39 | ||
| 40 | case 'o': | |
| 41 | oflg++; | |
| 42 | break; | |
| 43 | ||
| 44 | case 'a': | |
| 45 | asdata++; | |
| 46 | break; | |
| 47 | ||
| 48 | default: | |
| 49 | if (!isdigit(argv[0][i])) { | |
| 50 | fprintf(stderr, "Usage: strings [ - ] [ -o ] [ -# ] [ file ... ]\n"); | |
| 51 | exit(1); | |
| 52 | } | |
| 53 | minlength = argv[0][i] - '0'; | |
| 54 | for (i++; isdigit(argv[0][i]); i++) | |
| 55 | minlength = minlength * 10 + argv[0][i] - '0'; | |
| 56 | i--; | |
| 57 | break; | |
| 58 | } | |
| 59 | argc--, argv++; | |
| 60 | } | |
| 61 | do { | |
| 62 | if (argc > 0) { | |
| 63 | if (freopen(argv[0], "r", stdin) == NULL) { | |
| 64 | perror(argv[0]); | |
| 65 | exit(1); | |
| 66 | } | |
| 67 | infile = argv[0]; | |
| 68 | argc--, argv++; | |
| 69 | } | |
| 70 | fseek(stdin, (long) 0, 0); | |
| 71 | if (asdata || | |
| 72 | fread((char *)&header, sizeof header, 1, stdin) != 1 || | |
| 73 | !ismagic(header.a_magic)) { | |
| 74 | fseek(stdin, (long) 0, 0); | |
| 75 | find((long) 100000000L); | |
| 76 | continue; | |
| 77 | } | |
| 78 | fseek(stdin, (long) header.a_text, 1); | |
| 79 | find((long) header.a_data); | |
| 80 | } while (argc > 0); | |
| 81 | } | |
| 82 | ||
| 83 | find(cnt) | |
| 84 | long cnt; | |
| 85 | { | |
| 86 | static char buf[BUFSIZ]; | |
| 87 | register char *cp; | |
| 88 | register int c, cc; | |
| 89 | ||
| 90 | cp = buf, cc = 0; | |
| 91 | for (; cnt != 0; cnt--) { | |
| 92 | c = getc(stdin); | |
| 93 | if (c == '\n' || dirt(c) || cnt == 0) { | |
| 94 | if (cp > buf && cp[-1] == '\n') | |
| 95 | --cp; | |
| 96 | *cp++ = 0; | |
| 97 | if (cp > &buf[minlength]) { | |
| 98 | if (oflg) | |
| 99 | printf("%7D ", ftell(stdin) - cc - 1); | |
| 100 | printf("%s\n", buf); | |
| 101 | } | |
| 102 | cp = buf, cc = 0; | |
| 103 | } else { | |
| 104 | if (cp < &buf[sizeof buf - 2]) | |
| 105 | *cp++ = c; | |
| 106 | cc++; | |
| 107 | } | |
| 108 | if (ferror(stdin) || feof(stdin)) | |
| 109 | break; | |
| 110 | } | |
| 111 | } | |
| 112 | ||
| 113 | dirt(c) | |
| 114 | int c; | |
| 115 | { | |
| 116 | ||
| 117 | switch (c) { | |
| 118 | ||
| 119 | case '\n': | |
| 120 | case '\f': | |
| 121 | return (0); | |
| 122 | ||
| 123 | case 0177: | |
| 124 | return (1); | |
| 125 | ||
| 126 | default: | |
| 127 | return (c > 0200 || c < ' '); | |
| 128 | } | |
| 129 | } | |
| 130 | ||
| 131 | ismagic(a) | |
| 132 | int a; | |
| 133 | { | |
| 134 | ||
| 135 | switch (a) { | |
| 136 | ||
| 137 | case A_MAGIC1: | |
| 138 | case A_MAGIC2: | |
| 139 | case A_MAGIC3: | |
| 140 | case A_MAGIC4: | |
| 141 | return (1); | |
| 142 | } | |
| 143 | return (0); | |
| 144 | } |