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git/usage.c

338 lines
7.0 KiB

/*
* GIT - The information manager from hell
*
* Copyright (C) Linus Torvalds, 2005
*/
#include "git-compat-util.h"
#include "cache.h"
static void vreportf(const char *prefix, const char *err, va_list params)
{
char msg[4096];
char *p, *pend = msg + sizeof(msg);
size_t prefix_len = strlen(prefix);
if (sizeof(msg) <= prefix_len) {
fprintf(stderr, "BUG!!! too long a prefix '%s'\n", prefix);
abort();
}
memcpy(msg, prefix, prefix_len);
p = msg + prefix_len;
if (vsnprintf(p, pend - p, err, params) < 0)
*p = '\0'; /* vsnprintf() failed, clip at prefix */
for (; p != pend - 1 && *p; p++) {
if (iscntrl(*p) && *p != '\t' && *p != '\n')
*p = '?';
}
*(p++) = '\n'; /* we no longer need a NUL */
fflush(stderr);
write_in_full(2, msg, p - msg);
}
static NORETURN void usage_builtin(const char *err, va_list params)
{
vreportf("usage: ", err, params);
/*
* When we detect a usage error *before* the command dispatch in
* cmd_main(), we don't know what verb to report. Force it to this
* to facilitate post-processing.
*/
trace2_cmd_name("_usage_");
/*
* Currently, the (err, params) are usually just the static usage
* string which isn't very useful here. Usually, the call site
* manually calls fprintf(stderr,...) with the actual detailed
* syntax error before calling usage().
*
* TODO It would be nice to update the call sites to pass both
* the static usage string and the detailed error message.
*/
exit(129);
}
static void die_message_builtin(const char *err, va_list params)
{
trace2_cmd_error_va(err, params);
vreportf("fatal: ", err, params);
}
/*
* We call trace2_cmd_error_va() in the below functions first and
* expect it to va_copy 'params' before using it (because an 'ap' can
* only be walked once).
*/
static NORETURN void die_builtin(const char *err, va_list params)
{
report_fn die_message_fn = get_die_message_routine();
die_message_fn(err, params);
exit(128);
}
static void error_builtin(const char *err, va_list params)
{
trace2_cmd_error_va(err, params);
vreportf("error: ", err, params);
}
static void warn_builtin(const char *warn, va_list params)
{
trace2_cmd_error_va(warn, params);
vreportf("warning: ", warn, params);
}
static int die_is_recursing_builtin(void)
{
static int dying;
/*
* Just an arbitrary number X where "a < x < b" where "a" is
* "maximum number of pthreads we'll ever plausibly spawn" and
* "b" is "something less than Inf", since the point is to
* prevent infinite recursion.
*/
static const int recursion_limit = 1024;
dying++;
if (dying > recursion_limit) {
return 1;
} else if (dying == 2) {
warning("die() called many times. Recursion error or racy threaded death!");
return 0;
} else {
return 0;
}
}
/* If we are in a dlopen()ed .so write to a global variable would segfault
* (ugh), so keep things static. */
static NORETURN_PTR report_fn usage_routine = usage_builtin;
static NORETURN_PTR report_fn die_routine = die_builtin;
static report_fn die_message_routine = die_message_builtin;
static report_fn error_routine = error_builtin;
static report_fn warn_routine = warn_builtin;
static int (*die_is_recursing)(void) = die_is_recursing_builtin;
void set_die_routine(NORETURN_PTR report_fn routine)
{
die_routine = routine;
}
report_fn get_die_message_routine(void)
{
return die_message_routine;
}
void set_error_routine(report_fn routine)
{
error_routine = routine;
}
report_fn get_error_routine(void)
{
return error_routine;
}
void set_warn_routine(report_fn routine)
{
warn_routine = routine;
}
report_fn get_warn_routine(void)
{
return warn_routine;
}
void set_die_is_recursing_routine(int (*routine)(void))
{
die_is_recursing = routine;
}
void NORETURN usagef(const char *err, ...)
{
va_list params;
va_start(params, err);
usage_routine(err, params);
va_end(params);
}
void NORETURN usage(const char *err)
{
usagef("%s", err);
}
void NORETURN die(const char *err, ...)
{
va_list params;
if (die_is_recursing()) {
fputs("fatal: recursion detected in die handler\n", stderr);
exit(128);
}
va_start(params, err);
die_routine(err, params);
va_end(params);
}
static const char *fmt_with_err(char *buf, int n, const char *fmt)
{
char str_error[256], *err;
int i, j;
err = strerror(errno);
for (i = j = 0; err[i] && j < sizeof(str_error) - 1; ) {
if ((str_error[j++] = err[i++]) != '%')
continue;
if (j < sizeof(str_error) - 1) {
str_error[j++] = '%';
} else {
/* No room to double the '%', so we overwrite it with
* '\0' below */
j--;
break;
}
}
str_error[j] = 0;
/* Truncation is acceptable here */
snprintf(buf, n, "%s: %s", fmt, str_error);
return buf;
}
void NORETURN die_errno(const char *fmt, ...)
{
char buf[1024];
va_list params;
if (die_is_recursing()) {
fputs("fatal: recursion detected in die_errno handler\n",
stderr);
exit(128);
}
va_start(params, fmt);
die_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
va_end(params);
}
#undef die_message
int die_message(const char *err, ...)
{
va_list params;
va_start(params, err);
die_message_routine(err, params);
va_end(params);
return 128;
}
#undef die_message_errno
int die_message_errno(const char *fmt, ...)
{
char buf[1024];
va_list params;
va_start(params, fmt);
die_message_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
va_end(params);
return 128;
}
#undef error_errno
int error_errno(const char *fmt, ...)
{
char buf[1024];
va_list params;
va_start(params, fmt);
error_routine(fmt_with_err(buf, sizeof(buf), fmt), params);
va_end(params);
return -1;
}
#undef error
int error(const char *err, ...)
{
va_list params;
va_start(params, err);
error_routine(err, params);
va_end(params);
return -1;
}
void warning_errno(const char *warn, ...)
{
char buf[1024];
va_list params;
va_start(params, warn);
warn_routine(fmt_with_err(buf, sizeof(buf), warn), params);
va_end(params);
}
void warning(const char *warn, ...)
{
va_list params;
va_start(params, warn);
warn_routine(warn, params);
va_end(params);
}
/* Only set this, ever, from t/helper/, when verifying that bugs are caught. */
int BUG_exit_code;
static NORETURN void BUG_vfl(const char *file, int line, const char *fmt, va_list params)
{
char prefix[256];
va_list params_copy;
static int in_bug;
va_copy(params_copy, params);
/* truncation via snprintf is OK here */
snprintf(prefix, sizeof(prefix), "BUG: %s:%d: ", file, line);
vreportf(prefix, fmt, params);
if (in_bug)
abort();
in_bug = 1;
trace2_cmd_error_va(fmt, params_copy);
if (BUG_exit_code)
exit(BUG_exit_code);
abort();
}
NORETURN void BUG_fl(const char *file, int line, const char *fmt, ...)
{
va_list ap;
va_start(ap, fmt);
BUG_vfl(file, line, fmt, ap);
va_end(ap);
}
#ifdef SUPPRESS_ANNOTATED_LEAKS
void unleak_memory(const void *ptr, size_t len)
{
static struct suppressed_leak_root {
struct suppressed_leak_root *next;
char data[FLEX_ARRAY];
} *suppressed_leaks;
struct suppressed_leak_root *root;
FLEX_ALLOC_MEM(root, data, ptr, len);
root->next = suppressed_leaks;
suppressed_leaks = root;
}
#endif