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addr2line.c
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addr2line.c
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/**********************************************************************
addr2line.c -
$Author$
Copyright (C) 2010 Shinichiro Hamaji
**********************************************************************/
#include "ruby/config.h"
#include "ruby/missing.h"
#include "addr2line.h"
#include <stdio.h>
#include <errno.h>
#ifdef USE_ELF
#include <fcntl.h>
#include <limits.h>
#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#ifdef __OpenBSD__
#include <elf_abi.h>
#else
#include <elf.h>
#endif
/* Make alloca work the best possible way. */
#ifdef __GNUC__
# ifndef alloca
# define alloca __builtin_alloca
# endif
#else
# ifdef HAVE_ALLOCA_H
# include <alloca.h>
# else
# ifdef _AIX
#pragma alloca
# else
# ifndef alloca /* predefined by HP cc +Olibcalls */
void *alloca();
# endif
# endif /* AIX */
# endif /* HAVE_ALLOCA_H */
#endif /* __GNUC__ */
#ifdef HAVE_DLADDR
# include <dlfcn.h>
#endif
#define DW_LNS_copy 0x01
#define DW_LNS_advance_pc 0x02
#define DW_LNS_advance_line 0x03
#define DW_LNS_set_file 0x04
#define DW_LNS_set_column 0x05
#define DW_LNS_negate_stmt 0x06
#define DW_LNS_set_basic_block 0x07
#define DW_LNS_const_add_pc 0x08
#define DW_LNS_fixed_advance_pc 0x09
#define DW_LNS_set_prologue_end 0x0a /* DWARF3 */
#define DW_LNS_set_epilogue_begin 0x0b /* DWARF3 */
#define DW_LNS_set_isa 0x0c /* DWARF3 */
/* Line number extended opcode name. */
#define DW_LNE_end_sequence 0x01
#define DW_LNE_set_address 0x02
#define DW_LNE_define_file 0x03
#define DW_LNE_set_discriminator 0x04 /* DWARF4 */
#ifndef ElfW
# if SIZEOF_VOIDP == 8
# define ElfW(x) Elf64##_##x
# else
# define ElfW(x) Elf32##_##x
# endif
#endif
#ifndef ELF_ST_TYPE
# if SIZEOF_VOIDP == 8
# define ELF_ST_TYPE ELF64_ST_TYPE
# else
# define ELF_ST_TYPE ELF32_ST_TYPE
# endif
#endif
#ifndef PATH_MAX
#define PATH_MAX 4096
#endif
int kprintf(const char *fmt, ...);
typedef struct {
const char *dirname;
const char *filename;
const char *path; /* object path */
int line;
uintptr_t base_addr;
uintptr_t saddr;
const char *sname; /* function name */
} line_info_t;
typedef struct obj_info obj_info_t;
struct obj_info {
const char *path; /* object path */
int fd;
void *mapped;
size_t mapped_size;
uintptr_t base_addr;
obj_info_t *next;
};
/* Avoid consuming stack as this module may be used from signal handler */
static char binary_filename[PATH_MAX];
static unsigned long
uleb128(char **p)
{
unsigned long r = 0;
int s = 0;
for (;;) {
unsigned char b = *(unsigned char *)(*p)++;
if (b < 0x80) {
r += (unsigned long)b << s;
break;
}
r += (b & 0x7f) << s;
s += 7;
}
return r;
}
static long
sleb128(char **p)
{
long r = 0;
int s = 0;
for (;;) {
unsigned char b = *(unsigned char *)(*p)++;
if (b < 0x80) {
if (b & 0x40) {
r -= (0x80 - b) << s;
}
else {
r += (b & 0x3f) << s;
}
break;
}
r += (b & 0x7f) << s;
s += 7;
}
return r;
}
static const char *
get_nth_dirname(unsigned long dir, char *p)
{
if (!dir--) {
return "";
}
while (dir--) {
while (*p) p++;
p++;
if (!*p) {
kprintf("Unexpected directory number %lu in %s\n",
dir, binary_filename);
return "";
}
}
return p;
}
static void
fill_filename(int file, char *include_directories, char *filenames,
line_info_t *line)
{
int i;
char *p = filenames;
char *filename;
unsigned long dir;
for (i = 1; i <= file; i++) {
filename = p;
if (!*p) {
/* Need to output binary file name? */
kprintf("Unexpected file number %d in %s\n",
file, binary_filename);
return;
}
while (*p) p++;
p++;
dir = uleb128(&p);
/* last modified. */
uleb128(&p);
/* size of the file. */
uleb128(&p);
if (i == file) {
line->filename = filename;
line->dirname = get_nth_dirname(dir, include_directories);
}
}
}
static void
fill_line(int num_traces, void **traces, uintptr_t addr, int file, int line,
char *include_directories, char *filenames,
obj_info_t *obj, line_info_t *lines, int offset)
{
int i;
addr += obj->base_addr;
for (i = offset; i < num_traces; i++) {
uintptr_t a = (uintptr_t)traces[i];
/* We assume one line code doesn't result >100 bytes of native code.
We may want more reliable way eventually... */
if (addr < a && a < addr + 100) {
fill_filename(file, include_directories, filenames, &lines[i]);
lines[i].line = line;
}
}
}
static int
parse_debug_line_cu(int num_traces, void **traces, char **debug_line,
obj_info_t *obj, line_info_t *lines, int offset)
{
char *p, *cu_end, *cu_start, *include_directories, *filenames;
unsigned long unit_length;
int default_is_stmt, line_base;
unsigned int header_length, minimum_instruction_length, line_range,
opcode_base;
/* unsigned char *standard_opcode_lengths; */
/* The registers. */
unsigned long addr = 0;
unsigned int file = 1;
unsigned int line = 1;
/* unsigned int column = 0; */
int is_stmt;
/* int basic_block = 0; */
/* int end_sequence = 0; */
/* int prologue_end = 0; */
/* int epilogue_begin = 0; */
/* unsigned int isa = 0; */
p = *debug_line;
unit_length = *(unsigned int *)p;
p += sizeof(unsigned int);
if (unit_length == 0xffffffff) {
unit_length = *(unsigned long *)p;
p += sizeof(unsigned long);
}
cu_end = p + unit_length;
/*dwarf_version = *(unsigned short *)p;*/
p += 2;
header_length = *(unsigned int *)p;
p += sizeof(unsigned int);
cu_start = p + header_length;
minimum_instruction_length = *(unsigned char *)p;
p++;
is_stmt = default_is_stmt = *(unsigned char *)p;
p++;
line_base = *(signed char *)p;
p++;
line_range = *(unsigned char *)p;
p++;
opcode_base = *(unsigned char *)p;
p++;
/* standard_opcode_lengths = (unsigned char *)p - 1; */
p += opcode_base - 1;
include_directories = p;
/* temporary measure for compress-debug-sections */
if (p >= cu_end) return -1;
/* skip include directories */
while (*p) {
p = memchr(p, '\0', cu_end - p);
if (!p) return -1;
p++;
}
p++;
filenames = p;
p = cu_start;
#define FILL_LINE() \
do { \
fill_line(num_traces, traces, addr, file, line, \
include_directories, filenames, \
obj, lines, offset); \
/*basic_block = prologue_end = epilogue_begin = 0;*/ \
} while (0)
while (p < cu_end) {
unsigned long a;
unsigned char op = *p++;
switch (op) {
case DW_LNS_copy:
FILL_LINE();
break;
case DW_LNS_advance_pc:
a = uleb128(&p);
addr += a;
break;
case DW_LNS_advance_line: {
long a = sleb128(&p);
line += a;
break;
}
case DW_LNS_set_file:
file = (unsigned int)uleb128(&p);
break;
case DW_LNS_set_column:
/*column = (unsigned int)*/(void)uleb128(&p);
break;
case DW_LNS_negate_stmt:
is_stmt = !is_stmt;
break;
case DW_LNS_set_basic_block:
/*basic_block = 1; */
break;
case DW_LNS_const_add_pc:
a = ((255 - opcode_base) / line_range) *
minimum_instruction_length;
addr += a;
break;
case DW_LNS_fixed_advance_pc:
a = *(unsigned char *)p++;
addr += a;
break;
case DW_LNS_set_prologue_end:
/* prologue_end = 1; */
break;
case DW_LNS_set_epilogue_begin:
/* epilogue_begin = 1; */
break;
case DW_LNS_set_isa:
/* isa = (unsigned int)*/(void)uleb128(&p);
break;
case 0:
a = *(unsigned char *)p++;
op = *p++;
switch (op) {
case DW_LNE_end_sequence:
/* end_sequence = 1; */
FILL_LINE();
addr = 0;
file = 1;
line = 1;
/* column = 0; */
is_stmt = default_is_stmt;
/* end_sequence = 0; */
/* isa = 0; */
break;
case DW_LNE_set_address:
addr = *(unsigned long *)p;
p += sizeof(unsigned long);
break;
case DW_LNE_define_file:
kprintf("Unsupported operation in %s\n",
binary_filename);
break;
case DW_LNE_set_discriminator:
/* TODO:currently ignore */
uleb128(&p);
break;
default:
kprintf("Unknown extended opcode: %d in %s\n",
op, binary_filename);
}
break;
default: {
unsigned long addr_incr;
unsigned long line_incr;
a = op - opcode_base;
addr_incr = (a / line_range) * minimum_instruction_length;
line_incr = line_base + (a % line_range);
addr += (unsigned int)addr_incr;
line += (unsigned int)line_incr;
FILL_LINE();
}
}
}
*debug_line = p;
return 0;
}
static int
parse_debug_line(int num_traces, void **traces,
char *debug_line, unsigned long size,
obj_info_t *obj, line_info_t *lines, int offset)
{
char *debug_line_end = debug_line + size;
while (debug_line < debug_line_end) {
if (parse_debug_line_cu(num_traces, traces, &debug_line, obj, lines, offset))
return -1;
}
if (debug_line != debug_line_end) {
kprintf("Unexpected size of .debug_line in %s\n",
binary_filename);
}
return 0;
}
/* read file and fill lines */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
obj_info_t **objp, line_info_t *lines, int offset);
static void
append_obj(obj_info_t **objp)
{
obj_info_t *newobj = calloc(1, sizeof(obj_info_t));
if (*objp) (*objp)->next = newobj;
*objp = newobj;
}
static void
follow_debuglink(const char *debuglink, int num_traces, void **traces,
obj_info_t **objp, line_info_t *lines, int offset)
{
/* Ideally we should check 4 paths to follow gnu_debuglink,
but we handle only one case for now as this format is used
by some linux distributions. See GDB's info for detail. */
static const char global_debug_dir[] = "/usr/lib/debug";
const size_t global_debug_dir_len = sizeof(global_debug_dir) - 1;
char *p;
obj_info_t *o1 = *objp, *o2;
size_t len;
p = strrchr(binary_filename, '/');
if (!p) {
return;
}
p[1] = '\0';
len = strlen(binary_filename);
if (len >= PATH_MAX - global_debug_dir_len)
len = PATH_MAX - global_debug_dir_len - 1;
memmove(binary_filename + global_debug_dir_len, binary_filename, len);
memcpy(binary_filename, global_debug_dir, global_debug_dir_len);
len += global_debug_dir_len;
strlcpy(binary_filename + len, debuglink, PATH_MAX - len);
append_obj(objp);
o2 = *objp;
o2->base_addr = o1->base_addr;
o2->path = o1->path;
fill_lines(num_traces, traces, 0, objp, lines, offset);
}
/* read file and fill lines */
static uintptr_t
fill_lines(int num_traces, void **traces, int check_debuglink,
obj_info_t **objp, line_info_t *lines, int offset)
{
int i, j;
char *shstr;
char *section_name;
ElfW(Ehdr) *ehdr;
ElfW(Shdr) *shdr, *shstr_shdr;
ElfW(Shdr) *debug_line_shdr = NULL, *gnu_debuglink_shdr = NULL;
int fd;
off_t filesize;
char *file;
ElfW(Shdr) *symtab_shdr = NULL, *strtab_shdr = NULL;
ElfW(Shdr) *dynsym_shdr = NULL, *dynstr_shdr = NULL;
obj_info_t *obj = *objp;
uintptr_t dladdr_fbase = 0;
fd = open(binary_filename, O_RDONLY);
if (fd < 0) {
goto fail;
}
filesize = lseek(fd, 0, SEEK_END);
if (filesize < 0) {
int e = errno;
close(fd);
kprintf("lseek: %s\n", strerror(e));
goto fail;
}
#if SIZEOF_OFF_T > SIZEOF_SIZE_T
if (filesize > (off_t)SIZE_MAX) {
close(fd);
kprintf("Too large file %s\n", binary_filename);
goto fail;
}
#endif
lseek(fd, 0, SEEK_SET);
/* async-signal unsafe */
file = (char *)mmap(NULL, (size_t)filesize, PROT_READ, MAP_SHARED, fd, 0);
if (file == MAP_FAILED) {
int e = errno;
close(fd);
kprintf("mmap: %s\n", strerror(e));
goto fail;
}
ehdr = (ElfW(Ehdr) *)file;
if (memcmp(ehdr->e_ident, "\177ELF", 4) != 0) {
/*
* Huh? Maybe filename was overridden by setproctitle() and
* it match non-elf file.
*/
close(fd);
goto fail;
}
obj->fd = fd;
obj->mapped = file;
obj->mapped_size = (size_t)filesize;
shdr = (ElfW(Shdr) *)(file + ehdr->e_shoff);
shstr_shdr = shdr + ehdr->e_shstrndx;
shstr = file + shstr_shdr->sh_offset;
for (i = 0; i < ehdr->e_shnum; i++) {
section_name = shstr + shdr[i].sh_name;
switch (shdr[i].sh_type) {
case SHT_STRTAB:
if (!strcmp(section_name, ".strtab")) {
strtab_shdr = shdr + i;
}
else if (!strcmp(section_name, ".dynstr")) {
dynstr_shdr = shdr + i;
}
break;
case SHT_SYMTAB:
/* if (!strcmp(section_name, ".symtab")) */
symtab_shdr = shdr + i;
break;
case SHT_DYNSYM:
/* if (!strcmp(section_name, ".dynsym")) */
dynsym_shdr = shdr + i;
break;
case SHT_PROGBITS:
if (!strcmp(section_name, ".debug_line")) {
debug_line_shdr = shdr + i;
}
else if (!strcmp(section_name, ".gnu_debuglink")) {
gnu_debuglink_shdr = shdr + i;
}
break;
}
}
if (offset == -1) {
/* main executable */
offset = 0;
if (dynsym_shdr && dynstr_shdr) {
char *strtab = file + dynstr_shdr->sh_offset;
ElfW(Sym) *symtab = (ElfW(Sym) *)(file + dynsym_shdr->sh_offset);
int symtab_count = (int)(dynsym_shdr->sh_size / sizeof(ElfW(Sym)));
for (j = 0; j < symtab_count; j++) {
ElfW(Sym) *sym = &symtab[j];
Dl_info info;
void *h, *s;
if (ELF_ST_TYPE(sym->st_info) != STT_FUNC || sym->st_size <= 0) continue;
h = dlopen(NULL, RTLD_NOW|RTLD_LOCAL);
if (!h) continue;
s = dlsym(h, strtab + sym->st_name);
if (!s) continue;
if (dladdr(s, &info)) {
dladdr_fbase = (uintptr_t)info.dli_fbase;
break;
}
}
if (ehdr->e_type == ET_EXEC) {
obj->base_addr = 0;
}
else {
/* PIE (position-independent executable) */
obj->base_addr = dladdr_fbase;
}
}
}
if (!symtab_shdr) {
symtab_shdr = dynsym_shdr;
strtab_shdr = dynstr_shdr;
}
if (symtab_shdr && strtab_shdr) {
char *strtab = file + strtab_shdr->sh_offset;
ElfW(Sym) *symtab = (ElfW(Sym) *)(file + symtab_shdr->sh_offset);
int symtab_count = (int)(symtab_shdr->sh_size / sizeof(ElfW(Sym)));
for (j = 0; j < symtab_count; j++) {
ElfW(Sym) *sym = &symtab[j];
uintptr_t saddr = (uintptr_t)sym->st_value + obj->base_addr;
if (ELF_ST_TYPE(sym->st_info) != STT_FUNC || sym->st_size <= 0) continue;
for (i = offset; i < num_traces; i++) {
uintptr_t d = (uintptr_t)traces[i] - saddr;
if (lines[i].line > 0 || d <= 0 || d > (uintptr_t)sym->st_size)
continue;
/* fill symbol name and addr from .symtab */
lines[i].sname = strtab + sym->st_name;
lines[i].saddr = saddr;
lines[i].path = obj->path;
lines[i].base_addr = obj->base_addr;
}
}
}
if (!debug_line_shdr) {
/* This file doesn't have .debug_line section,
let's check .gnu_debuglink section instead. */
if (gnu_debuglink_shdr && check_debuglink) {
follow_debuglink(file + gnu_debuglink_shdr->sh_offset,
num_traces, traces,
objp, lines, offset);
}
goto finish;
}
if (parse_debug_line(num_traces, traces,
file + debug_line_shdr->sh_offset,
debug_line_shdr->sh_size,
obj, lines, offset))
goto fail;
finish:
return dladdr_fbase;
fail:
return (uintptr_t)-1;
}
#define HAVE_MAIN_EXE_PATH
#if defined(__FreeBSD__)
# include <sys/sysctl.h>
#endif
/* ssize_t main_exe_path(void)
*
* store the path of the main executable to `binary_filename`,
* and returns strlen(binary_filename).
* it is NUL terminated.
*/
#if defined(__linux__)
ssize_t
main_exe_path(void)
{
# define PROC_SELF_EXE "/proc/self/exe"
ssize_t len = readlink(PROC_SELF_EXE, binary_filename, PATH_MAX);
binary_filename[len] = 0;
return len;
}
#elif defined(__FreeBSD__)
ssize_t
main_exe_path(void)
{
int mib[4] = {CTL_KERN, KERN_PROC, KERN_PROC_PATHNAME, -1};
size_t len = PATH_MAX;
int err = sysctl(mib, 4, binary_filename, &len, NULL, 0);
if (err) {
kprintf("Can't get the path of ruby");
return -1;
}
len--; /* sysctl sets strlen+1 */
return len;
}
#else
#undef HAVE_MAIN_EXE_PATH
#endif
void
rb_dump_backtrace_with_lines(int num_traces, void **traces)
{
int i;
/* async-signal unsafe */
line_info_t *lines = (line_info_t *)calloc(num_traces, sizeof(line_info_t));
obj_info_t *obj = NULL;
/* 2 is NULL + main executable */
void **dladdr_fbases = (void **)calloc(num_traces+2, sizeof(void *));
#ifdef HAVE_MAIN_EXE_PATH
char *main_path = NULL; /* used on printing backtrace */
ssize_t len;
if ((len = main_exe_path()) > 0) {
main_path = (char *)alloca(len + 1);
if (main_path) {
uintptr_t addr;
memcpy(main_path, binary_filename, len+1);
append_obj(&obj);
obj->path = main_path;
addr = fill_lines(num_traces, traces, 1, &obj, lines, -1);
if (addr != (uintptr_t)-1) {
dladdr_fbases[0] = (void *)addr;
}
}
}
#endif
/* fill source lines by reading dwarf */
for (i = 0; i < num_traces; i++) {
Dl_info info;
if (lines[i].line) continue;
if (dladdr(traces[i], &info)) {
const char *path;
void **p;
/* skip symbols which is in already checked objects */
/* if the binary is strip-ed, this may effect */
for (p=dladdr_fbases; *p; p++) {
if (*p == info.dli_fbase) {
lines[i].path = info.dli_fname;
lines[i].sname = info.dli_sname;
goto next_line;
}
}
*p = info.dli_fbase;
append_obj(&obj);
obj->base_addr = (uintptr_t)info.dli_fbase;
path = info.dli_fname;
obj->path = path;
lines[i].path = path;
strlcpy(binary_filename, path, PATH_MAX);
if (fill_lines(num_traces, traces, 1, &obj, lines, i) == (uintptr_t)-1)
break;
}
next_line:
continue;
}
/* output */
for (i = 0; i < num_traces; i++) {
line_info_t *line = &lines[i];
uintptr_t addr = (uintptr_t)traces[i];
uintptr_t d = addr - line->saddr;
if (!line->path) {
kprintf("[0x%lx]\n", addr);
}
else if (!line->saddr || !line->sname) {
kprintf("%s [0x%lx]\n", line->path, addr);
}
else if (line->line <= 0) {
kprintf("%s(%s+0x%lx) [0x%lx]\n", line->path, line->sname,
d, addr);
}
else if (!line->filename) {
kprintf("%s(%s+0x%lx) [0x%lx] ???:%d\n", line->path, line->sname,
d, addr, line->line);
}
else if (line->dirname && line->dirname[0]) {
kprintf("%s(%s+0x%lx) [0x%lx] %s/%s:%d\n", line->path, line->sname,
d, addr, line->dirname, line->filename, line->line);
}
else {
kprintf("%s(%s+0x%lx) [0x%lx] %s:%d\n", line->path, line->sname,
d, addr, line->filename, line->line);
}
/* FreeBSD's backtrace may show _start and so on */
if (line->sname && strcmp("main", line->sname) == 0)
break;
}
/* free */
while (obj) {
obj_info_t *o = obj;
obj = o->next;
if (o->fd) {
munmap(o->mapped, o->mapped_size);
close(o->fd);
}
free(o);
}
free(lines);
free(dladdr_fbases);
}
/* From FreeBSD's lib/libstand/printf.c */
/*-
* Copyright (c) 1986, 1988, 1991, 1993
* The Regents of the University of California. All rights reserved.
* (c) UNIX System Laboratories, Inc.
* All or some portions of this file are derived from material licensed
* to the University of California by American Telephone and Telegraph
* Co. or Unix System Laboratories, Inc. and are reproduced herein with
* the permission of UNIX System Laboratories, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)subr_prf.c 8.3 (Berkeley) 1/21/94
*/
#include <stdarg.h>
#define MAXNBUF (sizeof(intmax_t) * CHAR_BIT + 1)
static inline int toupper(int c) { return ('A' <= c && c <= 'Z') ? (c&0x5f) : c; }
#define hex2ascii(hex) (hex2ascii_data[hex])
char const hex2ascii_data[] = "0123456789abcdefghijklmnopqrstuvwxyz";
static inline int imax(int a, int b) { return (a > b ? a : b); }
static int kvprintf(char const *fmt, void (*func)(int), void *arg, int radix, va_list ap);
static void putce(int c)
{
char s[1];
ssize_t ret;
s[0] = (char)c;
ret = write(2, s, 1);
(void)ret;
}
int
kprintf(const char *fmt, ...)
{
va_list ap;
int retval;
va_start(ap, fmt);
retval = kvprintf(fmt, putce, NULL, 10, ap);
va_end(ap);
return retval;
}
/*
* Put a NUL-terminated ASCII number (base <= 36) in a buffer in reverse
* order; return an optional length and a pointer to the last character
* written in the buffer (i.e., the first character of the string).
* The buffer pointed to by `nbuf' must have length >= MAXNBUF.
*/
static char *
ksprintn(char *nbuf, uintmax_t num, int base, int *lenp, int upper)
{
char *p, c;
p = nbuf;
*p = '\0';
do {
c = hex2ascii(num % base);
*++p = upper ? toupper(c) : c;
} while (num /= base);
if (lenp)
*lenp = (int)(p - nbuf);
return (p);
}
/*
* Scaled down version of printf(3).
*
* Two additional formats:
*
* The format %b is supported to decode error registers.
* Its usage is:
*
* printf("reg=%b\n", regval, "<base><arg>*");
*
* where <base> is the output base expressed as a control character, e.g.
* \10 gives octal; \20 gives hex. Each arg is a sequence of characters,
* the first of which gives the bit number to be inspected (origin 1), and
* the next characters (up to a control character, i.e. a character <= 32),
* give the name of the register. Thus:
*
* kvprintf("reg=%b\n", 3, "\10\2BITTWO\1BITONE\n");
*
* would produce output:
*
* reg=3<BITTWO,BITONE>
*
* XXX: %D -- Hexdump, takes pointer and separator string:
* ("%6D", ptr, ":") -> XX:XX:XX:XX:XX:XX
* ("%*D", len, ptr, " " -> XX XX XX XX ...
*/
static int
kvprintf(char const *fmt, void (*func)(int), void *arg, int radix, va_list ap)
{
#define PCHAR(c) {int cc=(c); if (func) (*func)(cc); else *d++ = cc; retval++; }
char nbuf[MAXNBUF];
char *d;
const char *p, *percent, *q;
unsigned char *up;
int ch, n;
uintmax_t num;
int base, lflag, qflag, tmp, width, ladjust, sharpflag, neg, sign, dot;
int cflag, hflag, jflag, tflag, zflag;
int dwidth, upper;
char padc;
int stop = 0, retval = 0;
num = 0;
if (!func)
d = (char *) arg;
else
d = NULL;
if (fmt == NULL)
fmt = "(fmt null)\n";
if (radix < 2 || radix > 36)
radix = 10;
for (;;) {
padc = ' ';
width = 0;
while ((ch = (unsigned char)*fmt++) != '%' || stop) {
if (ch == '\0')
return (retval);
PCHAR(ch);
}
percent = fmt - 1;
qflag = 0; lflag = 0; ladjust = 0; sharpflag = 0; neg = 0;
sign = 0; dot = 0; dwidth = 0; upper = 0;
cflag = 0; hflag = 0; jflag = 0; tflag = 0; zflag = 0;
reswitch: switch (ch = (unsigned char)*fmt++) {
case '.':
dot = 1;
goto reswitch;
case '#':
sharpflag = 1;
goto reswitch;
case '+':
sign = 1;
goto reswitch;
case '-':
ladjust = 1;
goto reswitch;
case '%':
PCHAR(ch);
break;
case '*':
if (!dot) {
width = va_arg(ap, int);
if (width < 0) {
ladjust = !ladjust;
width = -width;
}
} else {
dwidth = va_arg(ap, int);
}
goto reswitch;
case '0':
if (!dot) {
padc = '0';
goto reswitch;
}
case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
for (n = 0;; ++fmt) {
n = n * 10 + ch - '0';
ch = *fmt;
if (ch < '0' || ch > '9')
break;
}
if (dot)
dwidth = n;
else
width = n;
goto reswitch;
case 'b':
num = (unsigned int)va_arg(ap, int);
p = va_arg(ap, char *);
for (q = ksprintn(nbuf, num, *p++, NULL, 0); *q;)
PCHAR(*q--);
if (num == 0)
break;
for (tmp = 0; *p;) {
n = *p++;
if (num & (1 << (n - 1))) {
PCHAR(tmp ? ',' : '<');