projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| 41c680d7 BJ |
1 | /* Copyright (c) 1979 Regents of the University of California */ |
| 2 | #include "sh.h" | |
| 3 | ||
| 4 | /* | |
| 5 | * C Shell | |
| 6 | */ | |
| 7 | ||
| 8 | bool errspl; /* Argument to error was spliced by seterr2 */ | |
| 9 | char one[2] = { '1', 0 }; | |
| 10 | char *onev[2] = { one, NOSTR }; | |
| 11 | /* | |
| 12 | * Print error string s with optional argument arg. | |
| 13 | * This routine always resets or exits. The flag haderr | |
| 14 | * is set so the routine who catches the unwind can propogate | |
| 15 | * it if they want. | |
| 16 | * | |
| 17 | * Note that any open files at the point of error will eventually | |
| 18 | * be closed in the routine process in sh.c which is the only | |
| 19 | * place error unwinds are ever caught. | |
| 20 | */ | |
| 21 | error(s, arg) | |
| 22 | char *s; | |
| 23 | { | |
| 24 | register char **v; | |
| 25 | register char *ep; | |
| 26 | ||
| 27 | /* | |
| 28 | * Must flush before we print as we wish output before the error | |
| 29 | * to go on (some form of) standard output, while output after | |
| 30 | * goes on (some form of) diagnostic output. | |
| 31 | * If didfds then output will go to 1/2 else to FSHOUT/FSHDIAG. | |
| 32 | * See flush in sh.print.c. | |
| 33 | */ | |
| 34 | flush(); | |
| 35 | haderr = 1; /* Now to diagnostic output */ | |
| 36 | timflg = 0; /* This isn't otherwise reset */ | |
| 37 | if (v = pargv) | |
| 38 | blkfree(v), pargv = 0; | |
| 39 | if (v = gargv) | |
| 40 | blkfree(v), gargv = 0; | |
| 41 | ||
| 42 | /* | |
| 43 | * A zero arguments causes no printing, else print | |
| 44 | * an error diagnostic here. | |
| 45 | */ | |
| 46 | if (s) | |
| 47 | printf(s, arg), printf(".\n"); | |
| 48 | ||
| 49 | didfds = 0; /* Forget about 0,1,2 */ | |
| 50 | if ((ep = err) && errspl) | |
| 51 | xfree(ep); | |
| 52 | errspl = 0; | |
| 53 | ||
| 54 | /* | |
| 55 | * Reset the state of the input. | |
| 56 | * This buffered seek to end of file will also | |
| 57 | * clear the while/foreach stack. | |
| 58 | */ | |
| 59 | btoeof(); | |
| 60 | ||
| 61 | /* | |
| 62 | * Go away if -e or we are a child shell | |
| 63 | */ | |
| 64 | if (exiterr || child) | |
| 65 | exit(1); | |
| 66 | ||
| 67 | setq("status", onev, &shvhed); | |
| 68 | reset(); /* Unwind */ | |
| 69 | } | |
| 70 | ||
| 71 | /* | |
| 72 | * Perror is the shells version of perror which should otherwise | |
| 73 | * never be called. | |
| 74 | */ | |
| 75 | Perror(s) | |
| 76 | char *s; | |
| 77 | { | |
| 78 | ||
| 79 | /* | |
| 80 | * Perror uses unit 2, thus if we didn't set up the fd's | |
| 81 | * we must set up unit 2 now else the diagnostic will disappear | |
| 82 | */ | |
| 83 | if (!didfds) { | |
| 84 | register int oerrno = errno; | |
| 85 | ||
| 86 | dcopy(SHDIAG, 2); | |
| 87 | errno = oerrno; | |
| 88 | } | |
| 89 | perror(s); | |
| 90 | error(0); /* To exit or unwind */ | |
| 91 | } | |
| 92 | ||
| 93 | /* | |
| 94 | * For builtin functions, the routine bferr may be called | |
| 95 | * to print a diagnostic of the form: | |
| 96 | * name: Diagnostic. | |
| 97 | * where name has been setup by setname. | |
| 98 | * (Made into a macro to save space) | |
| 99 | * | |
| 100 | char *bname; | |
| 101 | ||
| 102 | setname(cp) | |
| 103 | char *cp; | |
| 104 | { | |
| 105 | ||
| 106 | bname = cp; | |
| 107 | } | |
| 108 | */ | |
| 109 | ||
| 110 | bferr(cp) | |
| 111 | char *cp; | |
| 112 | { | |
| 113 | ||
| 114 | flush(); | |
| 115 | haderr = 1; | |
| 116 | printf("%s: ", bname); | |
| 117 | error(cp); | |
| 118 | } | |
| 119 | ||
| 120 | /* | |
| 121 | * The parser and scanner set up errors for later by calling seterr, | |
| 122 | * which sets the variable err as a side effect; later to be tested, | |
| 123 | * e.g. in process. | |
| 124 | */ | |
| 125 | seterr(s) | |
| 126 | char *s; | |
| 127 | { | |
| 128 | ||
| 129 | if (err == 0) | |
| 130 | err = s, errspl = 0; | |
| 131 | } | |
| 132 | ||
| 133 | /* Set err to a splice of cp and dp, to be freed later in error() */ | |
| 134 | seterr2(cp, dp) | |
| 135 | char *cp, *dp; | |
| 136 | { | |
| 137 | ||
| 138 | if (err) | |
| 139 | return; | |
| 140 | err = strspl(cp, dp); | |
| 141 | errspl++; | |
| 142 | } | |
| 143 | ||
| 144 | /* Set err to a splice of cp with a string form of character d */ | |
| 145 | seterrc(cp, d) | |
| 146 | char *cp, d; | |
| 147 | { | |
| 148 | char chbuf[2]; | |
| 149 | ||
| 150 | chbuf[0] = d; | |
| 151 | chbuf[1] = 0; | |
| 152 | seterr2(cp, chbuf); | |
| 153 | } |