| /* |
| * GIT - The information manager from hell |
| * |
| * Copyright (C) Linus Torvalds, 2005 |
| */ |
| #include "git-compat-util.h" |
| #include "cache.h" |
| |
| 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 NORETURN void die_builtin(const char *err, va_list params) |
| { |
| /* |
| * We call this trace2 function first and expect it to va_copy 'params' |
| * before using it (because an 'ap' can only be walked once). |
| */ |
| trace2_cmd_error_va(err, params); |
| |
| vreportf("fatal: ", err, params); |
| |
| exit(128); |
| } |
| |
| static void error_builtin(const char *err, va_list params) |
| { |
| /* |
| * We call this trace2 function first and expect it to va_copy 'params' |
| * before using it (because an 'ap' can only be walked once). |
| */ |
| trace2_cmd_error_va(err, params); |
| |
| vreportf("error: ", err, params); |
| } |
| |
| static void warn_builtin(const char *warn, va_list params) |
| { |
| /* |
| * We call this trace2 function first and expect it to va_copy 'params' |
| * before using it (because an 'ap' can only be walked once). |
| */ |
| 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 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; |
| } |
| |
| 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 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]; |
| |
| /* truncation via snprintf is OK here */ |
| if (file) |
| snprintf(prefix, sizeof(prefix), "BUG: %s:%d: ", file, line); |
| else |
| snprintf(prefix, sizeof(prefix), "BUG: "); |
| |
| vreportf(prefix, fmt, params); |
| if (BUG_exit_code) |
| exit(BUG_exit_code); |
| abort(); |
| } |
| |
| #ifdef HAVE_VARIADIC_MACROS |
| 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); |
| } |
| #else |
| NORETURN void BUG(const char *fmt, ...) |
| { |
| va_list ap; |
| va_start(ap, fmt); |
| BUG_vfl(NULL, 0, fmt, ap); |
| va_end(ap); |
| } |
| #endif |
| |
| #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 |