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![Jeff King](/assets/img/avatar_default.png)
Commite208f9c
(make error()'s constant return value more visible, 2012-12-15) introduced some macro trickery to make the constant return from error() more visible to callers, which in turn can help gcc produce better warnings (and possibly even better code). Later,fd1d672
(usage.c: add warning_errno() and error_errno(), 2016-05-08) introduced another variant, and subsequent commits converted some uses of error() to error_errno(), losing the magic frome208f9c
for those sites. As a result, compiling vcs-svn/svndiff.c with "gcc -O3" produces -Wmaybe-uninitialized false positives (at least with gcc 6.2.0). Let's give error_errno() the same treatment, which silences these warnings. Signed-off-by: Jeff King <peff@peff.net> Signed-off-by: Junio C Hamano <gitster@pobox.com>
192 lines
3.8 KiB
C
192 lines
3.8 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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static int tweaked_error_buffering;
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void vreportf(const char *prefix, const char *err, va_list params)
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{
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FILE *fh = error_handle ? error_handle : stderr;
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fflush(fh);
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if (!tweaked_error_buffering) {
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setvbuf(fh, NULL, _IOLBF, 0);
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tweaked_error_buffering = 1;
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}
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fputs(prefix, fh);
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vfprintf(fh, err, params);
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fputc('\n', fh);
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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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tweaked_error_buffering = 0;
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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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static const char *fmt_with_err(char *buf, int n, const char *fmt)
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{
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char str_error[256], *err;
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int i, j;
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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(buf, n, "%s: %s", fmt, str_error);
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return buf;
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}
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void NORETURN die_errno(const char *fmt, ...)
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{
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char buf[1024];
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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_errno handler\n",
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stderr);
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exit(128);
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}
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va_start(params, fmt);
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die_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
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va_end(params);
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}
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#undef error_errno
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int error_errno(const char *fmt, ...)
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{
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char buf[1024];
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va_list params;
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va_start(params, fmt);
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error_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
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va_end(params);
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return -1;
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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_errno(const char *warn, ...)
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{
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char buf[1024];
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va_list params;
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va_start(params, warn);
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warn_routine(fmt_with_err(buf, sizeof(buf), warn), params);
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va_end(params);
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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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