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Diffstat (limited to 'usr/dash/error.c')
| -rw-r--r-- | usr/dash/error.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/usr/dash/error.c b/usr/dash/error.c new file mode 100644 index 0000000..9d31989 --- /dev/null +++ b/usr/dash/error.c @@ -0,0 +1,232 @@ +/*- + * Copyright (c) 1991, 1993 + * The Regents of the University of California. All rights reserved. + * Copyright (c) 1997-2005 + * Herbert Xu <herbert@gondor.apana.org.au>. All rights reserved. + * + * This code is derived from software contributed to Berkeley by + * Kenneth Almquist. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + */ + +/* + * Errors and exceptions. + */ + +#include <signal.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <stdio.h> +#include <string.h> + +#include "shell.h" +#include "main.h" +#include "options.h" +#include "output.h" +#include "error.h" +#include "show.h" +#include "eval.h" +#include "parser.h" +#include "system.h" + + +/* + * Code to handle exceptions in C. + */ + +struct jmploc *handler; +int exception; +int suppressint; +volatile sig_atomic_t intpending; +int errlinno; + + +static void exverror(int, const char *, va_list) + __attribute__((__noreturn__)); + +/* + * Called to raise an exception. Since C doesn't include exceptions, we + * just do a longjmp to the exception handler. The type of exception is + * stored in the global variable "exception". + */ + +void +exraise(int e) +{ +#ifdef DEBUG + if (handler == NULL) + abort(); +#endif + INTOFF; + + exception = e; + longjmp(handler->loc, 1); +} + + +/* + * Called from trap.c when a SIGINT is received. (If the user specifies + * that SIGINT is to be trapped or ignored using the trap builtin, then + * this routine is not called.) Suppressint is nonzero when interrupts + * are held using the INTOFF macro. (The test for iflag is just + * defensive programming.) + */ + +void +onint(void) { + + intpending = 0; + sigclearmask(); + if (!(rootshell && iflag)) { + signal(SIGINT, SIG_DFL); + raise(SIGINT); + } + exraise(EXINT); + /* NOTREACHED */ +} + +static void +exvwarning2(const char *msg, va_list ap) +{ + struct output *errs; + const char *name; + const char *fmt; + + errs = out2; + name = arg0 ? arg0 : "sh"; + if (!commandname) + fmt = "%s: %d: "; + else + fmt = "%s: %d: %s: "; + outfmt(errs, fmt, name, errlinno, commandname); + doformat(errs, msg, ap); +#if FLUSHERR + outc('\n', errs); +#else + outcslow('\n', errs); +#endif +} + +#define exvwarning(a, b, c) exvwarning2(b, c) + +/* + * Exverror is called to raise the error exception. If the second argument + * is not NULL then error prints an error message using printf style + * formatting. It then raises the error exception. + */ +static void +exverror(int cond, const char *msg, va_list ap) +{ +#ifdef DEBUG + if (msg) { + va_list aq; + TRACE(("exverror(%d, \"", cond)); + va_copy(aq, ap); + TRACEV((msg, aq)); + va_end(aq); + TRACE(("\") pid=%d\n", getpid())); + } else + TRACE(("exverror(%d, NULL) pid=%d\n", cond, getpid())); + if (msg) +#endif + exvwarning(-1, msg, ap); + + flushall(); + exraise(cond); + /* NOTREACHED */ +} + + +void +sh_error(const char *msg, ...) +{ + va_list ap; + + exitstatus = 2; + + va_start(ap, msg); + exverror(EXERROR, msg, ap); + /* NOTREACHED */ + va_end(ap); +} + + +void +exerror(int cond, const char *msg, ...) +{ + va_list ap; + + va_start(ap, msg); + exverror(cond, msg, ap); + /* NOTREACHED */ + va_end(ap); +} + +/* + * error/warning routines for external builtins + */ + +void +sh_warnx(const char *fmt, ...) +{ + va_list ap; + + va_start(ap, fmt); + exvwarning(-1, fmt, ap); + va_end(ap); +} + + +/* + * Return a string describing an error. The returned string may be a + * pointer to a static buffer that will be overwritten on the next call. + * Action describes the operation that got the error. + */ + +const char * +errmsg(int e, int action) +{ + if (e != ENOENT && e != ENOTDIR) + return strerror(e); + + if (action & E_OPEN) + return "No such file"; + else if (action & E_CREAT) + return "Directory nonexistent"; + else + return "not found"; +} + + +#ifdef REALLY_SMALL +void +__inton() { + if (--suppressint == 0 && intpending) { + onint(); + } +} +#endif |