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cd163d4b4e
It is theoretically possible for a die handler to get into a state of infinite recursion. For example, if a die handler called another function which itself called die(). Let's at least detect this situation, inform the user, and call exit. Signed-off-by: Brandon Casey <bcasey@nvidia.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
150 lines
3.1 KiB
C
150 lines
3.1 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 int dying;
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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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vsnprintf(msg, sizeof(msg), err, params);
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fprintf(stderr, "%s%s\n", prefix, msg);
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}
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void vwritef(int fd, const char *prefix, const char *err, va_list params)
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{
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char msg[4096];
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int len = vsnprintf(msg, sizeof(msg), err, params);
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if (len > sizeof(msg))
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len = sizeof(msg);
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write_in_full(fd, prefix, strlen(prefix));
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write_in_full(fd, msg, len);
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write_in_full(fd, "\n", 1);
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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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/* 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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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 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 (dying) {
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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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dying = 1;
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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 (dying) {
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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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dying = 1;
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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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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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