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Copy pathcommon.cpp
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2344 lines (2036 loc) · 61.1 KB
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/** \file common.c
Various functions, mostly string utilities, that are used by most
parts of fish.
*/
#include "config.h"
#include <unistd.h>
#ifdef HAVE_STROPTS_H
#include <stropts.h>
#endif
#ifdef HAVE_SIGINFO_H
#include <siginfo.h>
#endif
#include <stdlib.h>
#include <termios.h>
#include <wchar.h>
#include <string.h>
#include <stdio.h>
#include <dirent.h>
#include <sys/types.h>
#ifdef HAVE_SYS_IOCTL_H
#include <sys/ioctl.h>
#endif
#include <sys/stat.h>
#include <unistd.h>
#include <wctype.h>
#include <errno.h>
#include <limits.h>
#include <stdarg.h>
#include <locale.h>
#include <time.h>
#include <sys/time.h>
#include <fcntl.h>
#include <algorithm>
#ifdef HAVE_EXECINFO_H
#include <execinfo.h>
#endif
#if HAVE_NCURSES_H
#include <ncurses.h>
#else
#include <curses.h>
#endif
#if HAVE_TERM_H
#include <term.h>
#elif HAVE_NCURSES_TERM_H
#include <ncurses/term.h>
#endif
#include "fallback.h"
#include "util.h"
#include "wutil.h"
#include "common.h"
#include "expand.h"
#include "proc.h"
#include "wildcard.h"
#include "parser.h"
#include "complete.h"
#include "util.cpp"
#include "fallback.cpp"
struct termios shell_modes;
// Note we foolishly assume that pthread_t is just a primitive. But it might be a struct.
static pthread_t main_thread_id = 0;
static bool thread_assertions_configured_for_testing = false;
wchar_t ellipsis_char;
wchar_t omitted_newline_char;
char *profile=0;
const wchar_t *program_name;
int debug_level=1;
/**
This struct should be continually updated by signals as the term resizes, and as such always contain the correct current size.
*/
static struct winsize termsize;
static char *wcs2str_internal(const wchar_t *in, char *out);
void show_stackframe()
{
ASSERT_IS_NOT_FORKED_CHILD();
/* Hack to avoid showing backtraces in the tester */
if (program_name && ! wcscmp(program_name, L"(ignore)"))
return;
void *trace[32];
int i, trace_size = 0;
trace_size = backtrace(trace, 32);
char **messages = backtrace_symbols(trace, trace_size);
if (messages)
{
debug(0, L"Backtrace:");
for (i=0; i<trace_size; i++)
{
fwprintf(stderr, L"%s\n", messages[i]);
}
free(messages);
}
}
int fgetws2(wcstring *s, FILE *f)
{
int i=0;
wint_t c;
while (1)
{
errno=0;
c = getwc(f);
if (errno == EILSEQ || errno == EINTR)
{
continue;
}
switch (c)
{
/* End of line */
case WEOF:
case L'\n':
case L'\0':
return i;
/* Ignore carriage returns */
case L'\r':
break;
default:
i++;
s->push_back((wchar_t)c);
break;
}
}
}
/**
Converts the narrow character string \c in into its wide
equivalent, and return it
The string may contain embedded nulls.
This function encodes illegal character sequences in a reversible
way using the private use area.
*/
static wcstring str2wcs_internal(const char *in, const size_t in_len)
{
if (in_len == 0)
return wcstring();
assert(in != NULL);
wcstring result;
result.reserve(in_len);
mbstate_t state = {};
size_t in_pos = 0;
while (in_pos < in_len)
{
wchar_t wc = 0;
size_t ret = mbrtowc(&wc, &in[in_pos], in_len-in_pos, &state);
/* Determine whether to encode this characters with our crazy scheme */
bool use_encode_direct = false;
if (wc >= ENCODE_DIRECT_BASE && wc < ENCODE_DIRECT_BASE+256)
{
use_encode_direct = true;
}
else if (wc == INTERNAL_SEPARATOR)
{
use_encode_direct = true;
}
else if (ret == (size_t)(-2))
{
/* Incomplete sequence */
use_encode_direct = true;
}
else if (ret == (size_t)(-1))
{
/* Invalid data */
use_encode_direct = true;
}
else if (ret > in_len - in_pos)
{
/* Other error codes? Terrifying, should never happen */
use_encode_direct = true;
}
if (use_encode_direct)
{
wc = ENCODE_DIRECT_BASE + (unsigned char)in[in_pos];
result.push_back(wc);
in_pos++;
bzero(&state, sizeof state);
}
else if (ret == 0)
{
/* Embedded null byte! */
result.push_back(L'\0');
in_pos++;
bzero(&state, sizeof state);
}
else
{
/* Normal case */
result.push_back(wc);
in_pos += ret;
}
}
return result;
}
wcstring str2wcstring(const char *in, size_t len)
{
return str2wcs_internal(in, len);
}
wcstring str2wcstring(const char *in)
{
return str2wcs_internal(in, strlen(in));
}
wcstring str2wcstring(const std::string &in)
{
/* Handles embedded nulls! */
return str2wcs_internal(in.data(), in.size());
}
char *wcs2str(const wchar_t *in)
{
if (! in)
return NULL;
char *out;
size_t desired_size = MAX_UTF8_BYTES*wcslen(in)+1;
char local_buff[512];
if (desired_size <= sizeof local_buff / sizeof *local_buff)
{
// convert into local buff, then use strdup() so we don't waste malloc'd space
char *result = wcs2str_internal(in, local_buff);
if (result)
{
// It converted into the local buffer, so copy it
result = strdup(result);
if (! result)
{
DIE_MEM();
}
}
return result;
}
else
{
// here we fall into the bad case of allocating a buffer probably much larger than necessary
out = (char *)malloc(MAX_UTF8_BYTES*wcslen(in)+1);
if (!out)
{
DIE_MEM();
}
return wcs2str_internal(in, out);
}
return wcs2str_internal(in, out);
}
char *wcs2str(const wcstring &in)
{
return wcs2str(in.c_str());
}
/* This function is distinguished from wcs2str_internal in that it allows embedded null bytes */
std::string wcs2string(const wcstring &input)
{
std::string result;
result.reserve(input.size());
mbstate_t state;
memset(&state, 0, sizeof(state));
char converted[MB_LEN_MAX + 1];
for (size_t i=0; i < input.size(); i++)
{
wchar_t wc = input[i];
if (wc == INTERNAL_SEPARATOR)
{
}
else if ((wc >= ENCODE_DIRECT_BASE) &&
(wc < ENCODE_DIRECT_BASE+256))
{
result.push_back(wc - ENCODE_DIRECT_BASE);
}
else
{
bzero(converted, sizeof converted);
size_t len = wcrtomb(converted, wc, &state);
if (len == (size_t)(-1))
{
debug(1, L"Wide character %d has no narrow representation", wc);
memset(&state, 0, sizeof(state));
}
else
{
result.append(converted, len);
}
}
}
return result;
}
/**
Converts the wide character string \c in into it's narrow
equivalent, stored in \c out. \c out must have enough space to fit
the entire string.
This function decodes illegal character sequences in a reversible
way using the private use area.
*/
static char *wcs2str_internal(const wchar_t *in, char *out)
{
size_t res=0;
size_t in_pos=0;
size_t out_pos = 0;
mbstate_t state;
CHECK(in, 0);
CHECK(out, 0);
memset(&state, 0, sizeof(state));
while (in[in_pos])
{
if (in[in_pos] == INTERNAL_SEPARATOR)
{
}
else if ((in[in_pos] >= ENCODE_DIRECT_BASE) &&
(in[in_pos] < ENCODE_DIRECT_BASE+256))
{
out[out_pos++] = in[in_pos]- ENCODE_DIRECT_BASE;
}
else
{
res = wcrtomb(&out[out_pos], in[in_pos], &state);
if (res == (size_t)(-1))
{
debug(1, L"Wide character %d has no narrow representation", in[in_pos]);
memset(&state, 0, sizeof(state));
}
else
{
out_pos += res;
}
}
in_pos++;
}
out[out_pos] = 0;
return out;
}
char **wcsv2strv(const wchar_t * const *in)
{
size_t i, count = 0;
while (in[count] != 0)
count++;
char **res = (char **)malloc(sizeof(char *)*(count+1));
if (res == 0)
{
DIE_MEM();
}
for (i=0; i<count; i++)
{
res[i]=wcs2str(in[i]);
}
res[count]=0;
return res;
}
wcstring format_string(const wchar_t *format, ...)
{
va_list va;
va_start(va, format);
wcstring result = vformat_string(format, va);
va_end(va);
return result;
}
wcstring vformat_string(const wchar_t *format, va_list va_orig)
{
const int saved_err = errno;
/*
As far as I know, there is no way to check if a
vswprintf-call failed because of a badly formated string
option or because the supplied destination string was to
small. In GLIBC, errno seems to be set to EINVAL either way.
Because of this, on failiure we try to
increase the buffer size until the free space is
larger than max_size, at which point it will
conclude that the error was probably due to a badly
formated string option, and return an error. Make
sure to null terminate string before that, though.
*/
const size_t max_size = (128*1024*1024);
wchar_t static_buff[256];
size_t size = 0;
wchar_t *buff = NULL;
int status = -1;
while (status < 0)
{
/* Reallocate if necessary */
if (size == 0)
{
buff = static_buff;
size = sizeof static_buff;
}
else
{
size *= 2;
if (size >= max_size)
{
buff[0] = '\0';
break;
}
buff = (wchar_t *)realloc((buff == static_buff ? NULL : buff), size);
if (buff == NULL)
{
DIE_MEM();
}
}
/* Try printing */
va_list va;
va_copy(va, va_orig);
status = vswprintf(buff, size / sizeof(wchar_t), format, va);
va_end(va);
}
wcstring result = wcstring(buff);
if (buff != static_buff)
free(buff);
errno = saved_err;
return result;
}
void append_formatv(wcstring &str, const wchar_t *format, va_list ap)
{
/* Preserve errno across this call since it likes to stomp on it */
int err = errno;
str.append(vformat_string(format, ap));
errno = err;
}
void append_format(wcstring &str, const wchar_t *format, ...)
{
va_list va;
va_start(va, format);
append_formatv(str, format, va);
va_end(va);
}
wchar_t *wcsvarname(const wchar_t *str)
{
while (*str)
{
if ((!iswalnum(*str)) && (*str != L'_'))
{
return (wchar_t *)str;
}
str++;
}
return 0;
}
const wchar_t *wcsfuncname(const wchar_t *str)
{
return wcschr(str, L'/');
}
int wcsvarchr(wchar_t chr)
{
return iswalnum(chr) || chr == L'_';
}
/**
The glibc version of wcswidth seems to hang on some strings. fish uses this replacement.
*/
int my_wcswidth(const wchar_t *c)
{
return fish_wcswidth(c, wcslen(c));
}
wchar_t *quote_end(const wchar_t *pos)
{
wchar_t c = *pos;
while (1)
{
pos++;
if (!*pos)
return 0;
if (*pos == L'\\')
{
pos++;
if (!*pos)
return 0;
}
else
{
if (*pos == c)
{
return (wchar_t *)pos;
}
}
}
return 0;
}
wcstring wsetlocale(int category, const wchar_t *locale)
{
char *lang = locale ? wcs2str(locale) : NULL;
char *res = setlocale(category, lang);
free(lang);
/*
Use ellipsis if on known unicode system, otherwise use $
*/
char *ctype = setlocale(LC_CTYPE, NULL);
bool unicode = (strstr(ctype, ".UTF") || strstr(ctype, ".utf"));
ellipsis_char = unicode ? L'\x2026' : L'$';
// U+23CE is the "return" character
omitted_newline_char = unicode ? L'\x23CE' : L'~';
if (!res)
return wcstring();
else
return format_string(L"%s", res);
}
bool contains_internal(const wchar_t *a, ...)
{
const wchar_t *arg;
va_list va;
bool res = false;
CHECK(a, 0);
va_start(va, a);
while ((arg=va_arg(va, const wchar_t *))!= 0)
{
if (wcscmp(a,arg) == 0)
{
res = true;
break;
}
}
va_end(va);
return res;
}
/* wcstring variant of contains_internal. The first parameter is a wcstring, the rest are const wchar_t* */
__sentinel bool contains_internal(const wcstring &needle, ...)
{
const wchar_t *arg;
va_list va;
int res = 0;
va_start(va, needle);
while ((arg=va_arg(va, const wchar_t *))!= 0)
{
if (needle == arg)
{
res=1;
break;
}
}
va_end(va);
return res;
}
long read_blocked(int fd, void *buf, size_t count)
{
ssize_t res;
sigset_t chldset, oldset;
sigemptyset(&chldset);
sigaddset(&chldset, SIGCHLD);
VOMIT_ON_FAILURE(pthread_sigmask(SIG_BLOCK, &chldset, &oldset));
res = read(fd, buf, count);
VOMIT_ON_FAILURE(pthread_sigmask(SIG_SETMASK, &oldset, NULL));
return res;
}
ssize_t write_loop(int fd, const char *buff, size_t count)
{
size_t out_cum=0;
while (out_cum < count)
{
ssize_t out = write(fd, &buff[out_cum], count - out_cum);
if (out < 0)
{
if (errno != EAGAIN && errno != EINTR)
{
return -1;
}
}
else
{
out_cum += (size_t)out;
}
}
return (ssize_t)out_cum;
}
ssize_t read_loop(int fd, void *buff, size_t count)
{
ssize_t result;
do
{
result = read(fd, buff, count);
}
while (result < 0 && (errno == EAGAIN || errno == EINTR));
return result;
}
static bool should_debug(int level)
{
if (level > debug_level)
return false;
/* Hack to not print error messages in the tests */
if (program_name && ! wcscmp(program_name, L"(ignore)"))
return false;
return true;
}
static void debug_shared(const wcstring &msg)
{
const wcstring sb = wcstring(program_name) + L": " + msg;
wcstring sb2;
write_screen(sb, sb2);
fwprintf(stderr, L"%ls", sb2.c_str());
}
void debug(int level, const wchar_t *msg, ...)
{
if (! should_debug(level))
return;
int errno_old = errno;
va_list va;
va_start(va, msg);
wcstring local_msg = vformat_string(msg, va);
va_end(va);
debug_shared(local_msg);
errno = errno_old;
}
void debug(int level, const char *msg, ...)
{
if (! should_debug(level))
return;
int errno_old = errno;
char local_msg[512];
va_list va;
va_start(va, msg);
vsnprintf(local_msg, sizeof local_msg, msg, va);
va_end(va);
debug_shared(str2wcstring(local_msg));
errno = errno_old;
}
void debug_safe(int level, const char *msg, const char *param1, const char *param2, const char *param3, const char *param4, const char *param5, const char *param6, const char *param7, const char *param8, const char *param9, const char *param10, const char *param11, const char *param12)
{
const char * const params[] = {param1, param2, param3, param4, param5, param6, param7, param8, param9, param10, param11, param12};
if (! msg)
return;
/* Can't call printf, that may allocate memory Just call write() over and over. */
if (level > debug_level)
return;
int errno_old = errno;
size_t param_idx = 0;
const char *cursor = msg;
while (*cursor != '\0')
{
const char *end = strchr(cursor, '%');
if (end == NULL)
end = cursor + strlen(cursor);
write(STDERR_FILENO, cursor, end - cursor);
if (end[0] == '%' && end[1] == 's')
{
/* Handle a format string */
assert(param_idx < sizeof params / sizeof *params);
const char *format = params[param_idx++];
if (! format)
format = "(null)";
write(STDERR_FILENO, format, strlen(format));
cursor = end + 2;
}
else if (end[0] == '\0')
{
/* Must be at the end of the string */
cursor = end;
}
else
{
/* Some other format specifier, just skip it */
cursor = end + 1;
}
}
// We always append a newline
write(STDERR_FILENO, "\n", 1);
errno = errno_old;
}
void format_long_safe(char buff[128], long val)
{
if (val == 0)
{
strcpy(buff, "0");
}
else
{
/* Generate the string in reverse */
size_t idx = 0;
bool negative = (val < 0);
/* Note that we can't just negate val if it's negative, because it may be the most negative value. We do rely on round-towards-zero division though. */
while (val != 0)
{
long rem = val % 10;
buff[idx++] = '0' + (rem < 0 ? -rem : rem);
val /= 10;
}
if (negative)
buff[idx++] = '-';
buff[idx] = 0;
size_t left = 0, right = idx - 1;
while (left < right)
{
char tmp = buff[left];
buff[left++] = buff[right];
buff[right--] = tmp;
}
}
}
void format_long_safe(wchar_t buff[128], long val)
{
if (val == 0)
{
wcscpy(buff, L"0");
}
else
{
/* Generate the string in reverse */
size_t idx = 0;
bool negative = (val < 0);
while (val > 0)
{
long rem = val % 10;
/* Here we're assuming that wide character digits are contiguous - is that a correct assumption? */
buff[idx++] = L'0' + (wchar_t)(rem < 0 ? -rem : rem);
val /= 10;
}
if (negative)
buff[idx++] = L'-';
buff[idx] = 0;
size_t left = 0, right = idx - 1;
while (left < right)
{
wchar_t tmp = buff[left];
buff[left++] = buff[right];
buff[right--] = tmp;
}
}
}
void write_screen(const wcstring &msg, wcstring &buff)
{
const wchar_t *start, *pos;
int line_width = 0;
int tok_width = 0;
int screen_width = common_get_width();
if (screen_width)
{
start = pos = msg.c_str();
while (1)
{
int overflow = 0;
tok_width=0;
/*
Tokenize on whitespace, and also calculate the width of the token
*/
while (*pos && (!wcschr(L" \n\r\t", *pos)))
{
/*
Check is token is wider than one line.
If so we mark it as an overflow and break the token.
*/
if ((tok_width + fish_wcwidth(*pos)) > (screen_width-1))
{
overflow = 1;
break;
}
tok_width += fish_wcwidth(*pos);
pos++;
}
/*
If token is zero character long, we don't do anything
*/
if (pos == start)
{
start = pos = pos+1;
}
else if (overflow)
{
/*
In case of overflow, we print a newline, except if we already are at position 0
*/
wchar_t *token = wcsndup(start, pos-start);
if (line_width != 0)
buff.push_back(L'\n');
buff.append(format_string(L"%ls-\n", token));
free(token);
line_width=0;
}
else
{
/*
Print the token
*/
wchar_t *token = wcsndup(start, pos-start);
if ((line_width + (line_width!=0?1:0) + tok_width) > screen_width)
{
buff.push_back(L'\n');
line_width=0;
}
buff.append(format_string(L"%ls%ls", line_width?L" ":L"", token));
free(token);
line_width += (line_width!=0?1:0) + tok_width;
}
/*
Break on end of string
*/
if (!*pos)
{
break;
}
start=pos;
}
}
else
{
buff.append(msg);
}
buff.push_back(L'\n');
}
/**
Perform string escaping of a strinng by only quoting it. Assumes
the string has already been checked for characters that can not be
escaped this way.
*/
static wchar_t *escape_simple(const wchar_t *in)
{
wchar_t *out;
size_t len = wcslen(in);
out = (wchar_t *)malloc(sizeof(wchar_t)*(len+3));
if (!out)
DIE_MEM();
out[0] = L'\'';
wcscpy(&out[1], in);
out[len+1]=L'\'';
out[len+2]=0;
return out;
}
wchar_t *escape(const wchar_t *in_orig, escape_flags_t flags)
{
const wchar_t *in = in_orig;
bool escape_all = !!(flags & ESCAPE_ALL);
bool no_quoted = !!(flags & ESCAPE_NO_QUOTED);
bool no_tilde = !!(flags & ESCAPE_NO_TILDE);
wchar_t *out;
wchar_t *pos;
int need_escape=0;
int need_complex_escape=0;
if (!in)
{
debug(0, L"%s called with null input", __func__);
FATAL_EXIT();
}
if (!no_quoted && (wcslen(in) == 0))
{
out = wcsdup(L"''");
if (!out)
DIE_MEM();
return out;
}
out = (wchar_t *)malloc(sizeof(wchar_t)*(wcslen(in)*4 + 1));
pos = out;
if (!out)
DIE_MEM();
while (*in != 0)
{
if ((*in >= ENCODE_DIRECT_BASE) &&
(*in < ENCODE_DIRECT_BASE+256))
{
int val = *in - ENCODE_DIRECT_BASE;
int tmp;
*(pos++) = L'\\';
*(pos++) = L'X';
tmp = val/16;
*pos++ = tmp > 9? L'a'+(tmp-10):L'0'+tmp;
tmp = val%16;
*pos++ = tmp > 9? L'a'+(tmp-10):L'0'+tmp;
need_escape=need_complex_escape=1;
}
else
{
wchar_t c = *in;
switch (c)
{
case L'\t':
*(pos++) = L'\\';
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