b5a9e435c6
This reverts commit f4c3edc0b1.
The purpose of that commit was to let us write errors of
arbitrary length to stderr by skipping the intermediate
buffer and sending our varargs straight to fprintf. That
works, but it comes with a downside: we do not get access to
the varargs before they are sent to stderr.
On balance, it's not a good tradeoff. Error messages larger
than our 4K buffer are quite uncommon, and we've lost the
ability to make any modifications to the output (e.g., to
remove non-printable characters).
The only way to have both would be one of:
1. Write into a dynamic buffer. But this is a bad idea for
a low-level function that may be called when malloc()
has failed.
2. Do our own printf-format varargs parsing. This is too
complex to be worth the trouble.
Let's just revert that change and go back to a fixed buffer.
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
156 lines
3.2 KiB
C
156 lines
3.2 KiB
C
/*
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* GIT - The information manager from hell
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*
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* Copyright (C) Linus Torvalds, 2005
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*/
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#include "git-compat-util.h"
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#include "cache.h"
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static FILE *error_handle;
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void vreportf(const char *prefix, const char *err, va_list params)
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{
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char msg[4096];
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FILE *fh = error_handle ? error_handle : stderr;
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vsnprintf(msg, sizeof(msg), err, params);
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fprintf(fh, "%s%s\n", prefix, msg);
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}
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static NORETURN void usage_builtin(const char *err, va_list params)
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{
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vreportf("usage: ", err, params);
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exit(129);
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}
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static NORETURN void die_builtin(const char *err, va_list params)
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{
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vreportf("fatal: ", err, params);
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exit(128);
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}
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static void error_builtin(const char *err, va_list params)
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{
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vreportf("error: ", err, params);
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}
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static void warn_builtin(const char *warn, va_list params)
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{
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vreportf("warning: ", warn, params);
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}
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static int die_is_recursing_builtin(void)
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{
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static int dying;
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return dying++;
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}
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/* If we are in a dlopen()ed .so write to a global variable would segfault
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* (ugh), so keep things static. */
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static NORETURN_PTR void (*usage_routine)(const char *err, va_list params) = usage_builtin;
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static NORETURN_PTR void (*die_routine)(const char *err, va_list params) = die_builtin;
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static void (*error_routine)(const char *err, va_list params) = error_builtin;
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static void (*warn_routine)(const char *err, va_list params) = warn_builtin;
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static int (*die_is_recursing)(void) = die_is_recursing_builtin;
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void set_die_routine(NORETURN_PTR void (*routine)(const char *err, va_list params))
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{
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die_routine = routine;
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}
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void set_error_routine(void (*routine)(const char *err, va_list params))
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{
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error_routine = routine;
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}
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void set_die_is_recursing_routine(int (*routine)(void))
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{
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die_is_recursing = routine;
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}
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void set_error_handle(FILE *fh)
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{
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error_handle = fh;
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}
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void NORETURN usagef(const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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usage_routine(err, params);
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va_end(params);
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}
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void NORETURN usage(const char *err)
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{
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usagef("%s", err);
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}
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void NORETURN die(const char *err, ...)
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{
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va_list params;
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if (die_is_recursing()) {
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fputs("fatal: recursion detected in die handler\n", stderr);
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exit(128);
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}
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va_start(params, err);
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die_routine(err, params);
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va_end(params);
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}
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void NORETURN die_errno(const char *fmt, ...)
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{
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va_list params;
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char fmt_with_err[1024];
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char str_error[256], *err;
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int i, j;
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if (die_is_recursing()) {
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fputs("fatal: recursion detected in die_errno handler\n",
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stderr);
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exit(128);
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}
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err = strerror(errno);
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for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
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if ((str_error[j++] = err[i++]) != '%')
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continue;
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if (j < sizeof(str_error) - 1) {
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str_error[j++] = '%';
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} else {
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/* No room to double the '%', so we overwrite it with
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* '\0' below */
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j--;
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break;
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}
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}
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str_error[j] = 0;
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snprintf(fmt_with_err, sizeof(fmt_with_err), "%s: %s", fmt, str_error);
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va_start(params, fmt);
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die_routine(fmt_with_err, params);
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va_end(params);
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}
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#undef error
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int error(const char *err, ...)
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{
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va_list params;
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va_start(params, err);
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error_routine(err, params);
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va_end(params);
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return -1;
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}
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void warning(const char *warn, ...)
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{
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va_list params;
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va_start(params, warn);
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warn_routine(warn, params);
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va_end(params);
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}
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