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printf.c
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1894 lines (1624 loc) · 43.8 KB
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/*
* printf.c - All the code for sprintf/printf.
*/
/*
* Copyright (C) 1986, 1988, 1989, 1991-2025,
* the Free Software Foundation, Inc.
*
* This file is part of GAWK, the GNU implementation of the
* AWK Programming Language.
*
* GAWK is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* GAWK is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA
*/
#include "awk.h"
struct flags {
bool left_just;
bool alt;
bool zero;
bool space;
bool plus;
bool quote;
bool have_prec;
bool magic_posix_flag;
char format;
int base;
int field_width;
int precision;
bool negative;
};
extern int max_args;
extern NODE **args_array;
extern FILE *output_fp;
#define DEFAULT_G_PRECISION 6
static size_t mbc_byte_count(const char *ptr, size_t numchars);
static size_t mbc_char_count(const char *ptr, size_t numbytes);
static void reverse(char *str);
static bool compute_zero_flag(struct flags *flags);
static void adjust_flags(struct flags *flags);
static char *add_thousands(const char *original);
static char *format_integer_digits(NODE *arg, struct flags *flags, bool *used_float);
static char *format_mpg_integer_digits(NODE *arg, struct flags *flags, bool *used_float);
static char *format_signed_integer(NODE *arg, struct flags *flags);
static char *format_unsigned_integer(NODE *arg, struct flags *flags);
static char *format_float(NODE *arg, struct flags *flags);
static char *format_out_of_range(NODE *arg, struct flags *flags);
static char *fill_to_field_width(char *startval, struct flags *flags, int fill);
static char *add_plus_or_space_and_fill(char *number_value, struct flags *flags);
static char *zero_fill_to_precision(char *number_value, struct flags *flags);
static char *add_alt_format(char *number_value, struct flags *flags);
#ifdef HAVE_MPFR
/*
* mpz2mpfr --- convert an arbitrary-precision integer to a float
* without any loss of precision. The returned value is only
* good for temporary use.
*/
static mpfr_ptr
mpz2mpfr(mpz_ptr zi)
{
size_t prec;
static mpfr_t mpfrval;
static bool inited = false;
int tval;
/* estimate minimum precision for exact conversion */
prec = mpz_sizeinbase(zi, 2); /* most significant 1 bit position starting at 1 */
prec -= (size_t) mpz_scan1(zi, 0); /* least significant 1 bit index starting at 0 */
if (prec < MPFR_PREC_MIN)
prec = MPFR_PREC_MIN;
else if (prec > MPFR_PREC_MAX)
prec = MPFR_PREC_MAX;
if (! inited) {
mpfr_init2(mpfrval, prec);
inited = true;
} else
mpfr_set_prec(mpfrval, prec);
tval = mpfr_set_z(mpfrval, zi, ROUND_MODE);
IEEE_FMT(mpfrval, tval);
return mpfrval;
}
#endif
/*
* format_args() formats arguments of sprintf,
* and according to a fmt_string providing a format like in
* printf family from C library. Returns a string node whose value
* is a formatted string. Called by sprintf function.
*
* It is one of the uglier parts of gawk. Thanks to Michal Jaegermann
* for taming this beast and making it compatible with ANSI C.
*
* July 2024: Refactored into something (more) manageable.
*/
NODE *
format_args(
const char *fmt_string,
size_t n0,
NODE *the_args[],
long num_args)
{
/* copy 'l' bytes from 's' to 'obufout' checking for space in the process */
/* difference of pointers should be of ptrdiff_t type, but let us be kind */
#define bchunk(s, l) if (l) { \
while ((l) > ofre) { \
size_t olen = obufout - obuf; \
erealloc(obuf, char *, osiz * 2); \
ofre += osiz; \
osiz *= 2; \
obufout = obuf + olen; \
} \
memcpy(obufout, s, (size_t) (l)); \
obufout += (l); \
ofre -= (l); \
}
/* copy one byte from 's' to 'obufout' checking for space in the process */
#define bchunk_one(s) { \
if (ofre < 1) { \
size_t olen = obufout - obuf; \
erealloc(obuf, char *, osiz * 2); \
ofre += osiz; \
osiz *= 2; \
obufout = obuf + olen; \
} \
*obufout++ = *s; \
--ofre; \
}
/* Is there space for something L big in the buffer? */
#define chksize(l) if ((l) >= ofre) { \
size_t olen = obufout - obuf; \
size_t delta = osiz+l-ofre; \
erealloc(obuf, char *, osiz + delta); \
obufout = obuf + olen; \
ofre += delta; \
osiz += delta; \
}
size_t cur_arg = 0;
NODE *r = NULL;
bool toofew = false;
char *obuf, *obufout;
size_t osiz, ofre, olen_final;
const char *s0, *s1;
int cs1;
NODE *arg;
long fw, prec, argnum;
bool used_dollar;
bool lj, alt, have_prec, need_format;
long *cur = NULL;
uintmax_t uval;
int base;
bool space_flag;
bool plus_flag;
struct {
char *buf;
size_t bufsize;
char stackbuf[30];
} cpbuf;
char *cend = &cpbuf.stackbuf[sizeof(cpbuf.stackbuf)];
char *cp;
const char *fill;
char signchar = '\0';
size_t len;
bool zero_flag = false;
bool quote_flag = false;
size_t copy_count, char_count;
bool magic_posix_flag;
struct flags flags;
static const char sp[] = " ";
static const char bad_modifiers[] = "DHhjLltwz";
static bool warned[sizeof(bad_modifiers)-1]; // auto-init to zero
bool modifier_seen[sizeof(bad_modifiers)-1];
#define modifier_index(c) (strchr(bad_modifiers, c) - bad_modifiers)
const char *formatted = NULL;
#define INITIAL_OUT_SIZE 64
emalloc(obuf, char *, INITIAL_OUT_SIZE);
obufout = obuf;
osiz = INITIAL_OUT_SIZE;
ofre = osiz - 1;
cur_arg = 1;
cpbuf.bufsize = sizeof(cpbuf.stackbuf);
cpbuf.buf = cpbuf.stackbuf;
/*
* Check first for use of `count$'.
* If plain argument retrieval was used earlier, choke.
* Otherwise, return the requested argument.
* If not `count$' now, but it was used earlier, choke.
* If this format is more than total number of args, choke.
* Otherwise, return the current argument.
*/
#define parse_next_arg() { \
if (argnum > 0) { \
if (cur_arg > 1) { \
msg(_("fatal: must use `count$' on all formats or none")); \
goto out; \
} \
arg = the_args[argnum]; \
} else if (used_dollar) { \
msg(_("fatal: must use `count$' on all formats or none")); \
arg = 0; /* shutup the compiler */ \
goto out; \
} else if (cur_arg >= num_args) { \
arg = 0; /* shutup the compiler */ \
toofew = true; \
break; \
} else { \
arg = the_args[cur_arg]; \
cur_arg++; \
} \
}
need_format = false;
used_dollar = false;
s0 = s1 = fmt_string;
while (n0-- > 0) {
if (*s1 != '%') {
s1++;
continue;
}
need_format = true;
bchunk(s0, s1 - s0);
s0 = s1;
cur = &fw;
fw = 0;
prec = 0;
base = 0;
argnum = 0;
base = 0;
have_prec = false;
signchar = '\0';
zero_flag = false;
quote_flag = false;
space_flag = false;
plus_flag = false;
lj = alt = false;
memset(modifier_seen, 0, sizeof(modifier_seen));
magic_posix_flag = false;
fill = sp;
cp = cend;
s1++;
memset(& flags, 0, sizeof(flags));
retry:
if (n0-- == 0) /* ran out early! */
break;
switch (cs1 = *s1++) {
case (-1): /* dummy case to allow for checking */
check_pos:
if (cur != &fw)
break; /* reject as a valid format */
goto retry;
case '%':
need_format = false;
/*
* 29 Oct. 2002:
* The C99 standard pages 274 and 279 seem to imply that
* since there's no arg converted, the field width doesn't
* apply. The code already was that way, but this
* comment documents it, at least in the code.
*
* 27 June 2024:
* This is still the case. The 2023 standard says you shouldn't
* have anything between the percents.
*/
if (do_lint) {
const char *msg = NULL;
if (fw != 0 && ! have_prec)
msg = _("field width is ignored for `%%' specifier");
else if (fw == 0 && have_prec)
msg = _("precision is ignored for `%%' specifier");
else if (fw && have_prec)
msg = _("field width and precision are ignored for `%%' specifier");
if (msg != NULL)
lintwarn("%s", msg);
}
bchunk_one("%");
s0 = s1;
break;
case '0':
/*
* Only turn on zero_flag if we haven't seen
* the field width or precision yet. Otherwise,
* screws up floating point formatting.
*/
if (cur == & fw)
zero_flag = true;
if (lj)
goto retry;
/* fall through */
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
if (cur == NULL)
break;
if (prec >= 0)
*cur = cs1 - '0';
/*
* with a negative precision *cur is already set
* to -1, so it will remain negative, but we have
* to "eat" precision digits in any case
*/
while (n0 > 0 && *s1 >= '0' && *s1 <= '9') {
--n0;
*cur = *cur * 10 + *s1++ - '0';
}
if (prec < 0) /* negative precision is discarded */
have_prec = false;
if (cur == &prec)
cur = NULL;
if (n0 == 0) /* badly formatted control string */
continue;
goto retry;
case '$':
if (do_traditional) {
msg(_("fatal: `$' is not permitted in awk formats"));
goto out;
}
if (cur == &fw) {
argnum = fw;
fw = 0;
used_dollar = true;
if (argnum <= 0) {
msg(_("fatal: argument index with `$' must be > 0"));
goto out;
}
if (argnum >= num_args) {
msg(_("fatal: argument index %ld greater than total number of supplied arguments"), argnum);
goto out;
}
} else {
argnum = prec;
prec = 0;
used_dollar = true;
if (argnum <= 0) {
msg(_("fatal: argument index with `$' must be > 0"));
goto out;
}
if (argnum >= num_args) {
msg(_("fatal: argument index %ld greater than total number of supplied arguments"), argnum);
goto out;
}
}
goto retry;
case '*':
if (cur == NULL)
break;
if (! do_traditional && used_dollar && ! isdigit((unsigned char) *s1)) {
fatal(_("fatal: must use `count$' on all formats or none"));
break; /* silence warnings */
} else if (! do_traditional && isdigit((unsigned char) *s1)) {
int val = 0;
for (; n0 > 0 && *s1 && isdigit((unsigned char) *s1); s1++, n0--) {
val *= 10;
val += *s1 - '0';
}
if (*s1 != '$') {
msg(_("fatal: no `$' supplied for positional field width or precision"));
goto out;
} else {
s1++;
n0--;
}
// val could be less than zero if someone provides a field width
// so large that it causes integer overflow. Mainly fuzzers do this,
// but let's try to be good anyway.
if (val < 0 || val >= num_args) {
toofew = true;
break;
}
arg = the_args[val];
} else {
parse_next_arg();
}
(void) force_number(arg);
*cur = get_number_si(arg);
if (*cur < 0 && cur == &fw) {
*cur = -*cur;
lj = true;
}
if (cur == &prec) {
if (*cur >= 0)
have_prec = true;
else
have_prec = false;
cur = NULL;
}
goto retry;
case ' ': /* print ' ' or '-' */
/* 'space' flag is ignored */
/* if '+' already present */
space_flag = true;
if (signchar != '\0')
goto check_pos;
signchar = cs1;
goto check_pos;
case '+': /* print '+' or '-' */
plus_flag = true;
signchar = cs1;
goto check_pos;
case '-':
if (prec < 0)
break;
if (cur == &prec) {
prec = -1;
goto retry;
}
fill = sp; /* if left justified then other */
lj = true; /* filling is ignored */
goto check_pos;
case '.':
if (cur != &fw)
break;
cur = ≺
have_prec = true;
goto retry;
case '#':
alt = true;
goto check_pos;
case '\'':
#if defined(HAVE_LOCALE_H)
quote_flag = true;
goto check_pos;
#else
goto retry;
#endif
case 'D':
case 'H':
case 'h':
case 'j':
case 'L':
case 'l':
case 't':
case 'w':
case 'z':
if (modifier_seen[modifier_index(cs1)])
break;
else {
int ind = modifier_index(cs1);
if (do_lint && ! warned[ind]) {
lintwarn(_("`%c' is meaningless in awk formats; ignored"), cs1);
warned[ind] = true;
}
if (do_posix) {
msg(_("fatal: `%c' is not permitted in POSIX awk formats"), cs1);
goto out;
}
}
modifier_seen[modifier_index(cs1)] = true;
goto retry;
case 'P':
if (magic_posix_flag)
break;
magic_posix_flag = true;
goto retry;
case 'C': // POSIX 2024 extension, undocumented for now
cs1 = 'c';
// FALL THROUGH
case 'c':
need_format = false;
parse_next_arg();
/* user input that looks numeric is numeric */
fixtype(arg);
if ((arg->flags & NUMBER) != 0) {
uval = get_number_uj(arg);
if (gawk_mb_cur_max > 1) {
char buf[100];
wchar_t wc;
mbstate_t mbs;
size_t count;
memset(& mbs, 0, sizeof(mbs));
/* handle systems with too small wchar_t */
if (sizeof(wchar_t) < 4 && uval > 0xffff) {
if (do_lint)
lintwarn(
_("[s]printf: value %g is too big for %%c format"),
arg->numbr);
goto out0;
}
wc = uval;
count = wcrtomb(buf, wc, & mbs);
if (count == 0
|| count == (size_t) -1) {
if (do_lint)
lintwarn(
_("[s]printf: value %g is not a valid wide character"),
arg->numbr);
goto out0;
}
memcpy(cpbuf.buf, buf, count);
prec = count;
cp = cpbuf.buf;
goto pr_tail;
}
out0:
;
/* else,
fall through */
cpbuf.buf[0] = uval;
prec = 1;
cp = cpbuf.buf;
goto pr_tail;
}
/*
* As per POSIX, only output the first character of a
* string value. Thus, we ignore any provided
* precision, forcing it to 1. (Didn't this
* used to work? 6/2003.)
*/
cp = arg->stptr;
prec = 1;
/*
* First character can be multiple bytes if
* it's a multibyte character. Grr.
*/
if (gawk_mb_cur_max > 1) {
mbstate_t state;
size_t count;
memset(& state, 0, sizeof(state));
count = mbrlen(cp, arg->stlen, & state);
if (count != (size_t) -1 && count != (size_t) -2 && count > 0) {
prec = count;
/* may need to increase fw so that padding happens, see pr_tail code */
if (fw > 0)
fw += count - 1;
}
}
goto pr_tail;
case 'S': // POSIX 2024 extension, undocumented for now
cs1 = 's';
// FALL THROUGH
case 's':
need_format = false;
parse_next_arg();
arg = force_string(arg);
if (fw == 0 && ! have_prec)
prec = arg->stlen;
else {
char_count = mbc_char_count(arg->stptr, arg->stlen);
if (! have_prec || prec > char_count)
prec = char_count;
}
cp = arg->stptr;
pr_tail:
if (! lj) {
while (fw > prec) {
bchunk_one(fill);
fw--;
}
}
copy_count = prec;
if (fw == 0 && ! have_prec)
;
else if (gawk_mb_cur_max > 1) {
if (cs1 == 's') {
assert(cp == arg->stptr || cp == cpbuf.buf);
copy_count = mbc_byte_count(arg->stptr, prec);
}
/* prec was set by code for %c */
/* else
copy_count = prec; */
}
bchunk(cp, copy_count);
while (fw > prec) {
bchunk_one(fill);
fw--;
}
s0 = s1;
break;
case 'd':
case 'i':
need_format = false;
parse_next_arg();
(void) force_number(arg);
base = 10;
#define set_flags() \
flags.left_just = lj; \
flags.alt = alt; \
flags.zero = zero_flag; \
flags.space = space_flag; \
flags.plus = plus_flag; \
flags.quote = quote_flag; \
flags.have_prec = have_prec; \
flags.format = cs1; \
flags.base = base; \
flags.field_width = fw; \
flags.precision = prec; \
flags.negative = false
set_flags();
adjust_flags(& flags);
formatted = format_signed_integer(arg, & flags);
len = strlen(formatted);
chksize(len)
strcpy(obufout, formatted);
free((void *) formatted);
ofre -= len;
obufout += len;
s0 = s1;
break;
case 'X':
case 'x':
base += 6; /* FALL THROUGH */
case 'u':
base += 2; /* FALL THROUGH */
case 'o':
base += 8;
need_format = false;
parse_next_arg();
(void) force_number(arg);
set_flags();
adjust_flags(& flags);
formatted = format_unsigned_integer(arg, & flags);
len = strlen(formatted);
chksize(len)
strcpy(obufout, formatted);
free((void *) formatted);
ofre -= len;
obufout += len;
s0 = s1;
break;
#if defined(PRINTF_HAS_A_FORMAT) && PRINTF_HAS_A_FORMAT == 1
case 'A':
case 'a':
{
static bool warned = false;
if (do_lint && tolower(cs1) == 'a' && ! warned) {
warned = true;
lintwarn(_("%%%c format is POSIX standard but not portable to other awks"), cs1);
}
base = 6;
goto format_float;
}
#endif
case 'F':
#if ! defined(PRINTF_HAS_F_FORMAT) || PRINTF_HAS_F_FORMAT != 1
cs1 = 'f';
/* FALL THROUGH */
#endif
case 'g':
case 'G':
case 'e':
case 'f':
case 'E':
format_float:
base += 10;
need_format = false;
parse_next_arg();
(void) force_number(arg);
set_flags();
adjust_flags(& flags);
formatted = format_float(arg, & flags);
len = strlen(formatted);
chksize(len)
strcpy(obufout, formatted);
free((void *) formatted);
ofre -= len;
obufout += len;
s0 = s1;
break;
default:
if (do_lint && is_alpha(cs1))
lintwarn(_("ignoring unknown format specifier character `%c': no argument converted"), cs1);
break;
}
if (toofew) {
msg("%s\n\t`%s'\n\t%*s%s",
_("fatal: not enough arguments to satisfy format string"),
fmt_string, (int) (s1 - fmt_string - 1), "",
_("^ ran out for this one"));
goto out;
}
}
if (do_lint) {
if (need_format)
lintwarn(
_("[s]printf: format specifier does not have control letter"));
if (cur_arg < num_args)
lintwarn(
_("too many arguments supplied for format string"));
}
bchunk(s0, s1 - s0);
olen_final = obufout - obuf;
#define GIVE_BACK_SIZE (INITIAL_OUT_SIZE * 2)
if (ofre > GIVE_BACK_SIZE)
erealloc(obuf, char *, olen_final + 1);
r = make_str_node(obuf, olen_final, ALREADY_MALLOCED);
obuf = NULL;
out:
if (cpbuf.buf != cpbuf.stackbuf)
efree(cpbuf.buf);
if (obuf != NULL)
efree(obuf);
if (r == NULL)
gawk_exit(EXIT_FATAL);
return r;
}
/* printf_common --- common code for sprintf and printf */
static NODE *
printf_common(int nargs)
{
int i;
NODE *r, *tmp;
assert(nargs > 0 && nargs <= max_args);
for (i = 1; i <= nargs; i++) {
tmp = args_array[nargs - i] = POP();
if (tmp->type == Node_var_array) {
while (--i > 0)
DEREF(args_array[nargs - i]);
fatal(_("attempt to use array `%s' in a scalar context"), array_vname(tmp));
}
}
args_array[0] = force_string(args_array[0]);
if (do_lint && (fixtype(args_array[0])->flags & STRING) == 0)
lintwarn(_("%s: received non-string format string argument"), "printf/sprintf");
r = format_args(args_array[0]->stptr, args_array[0]->stlen, args_array, nargs);
for (i = 0; i < nargs; i++)
DEREF(args_array[i]);
return r;
}
/* do_sprintf --- perform sprintf */
NODE *
do_sprintf(int nargs)
{
NODE *r;
if (nargs == 0)
fatal(_("sprintf: no arguments"));
r = printf_common(nargs);
if (r == NULL)
gawk_exit(EXIT_FATAL);
return r;
}
/* do_printf --- perform printf, including redirection */
void
do_printf(int nargs, int redirtype)
{
FILE *fp = NULL;
NODE *tmp;
struct redirect *rp = NULL;
int errflg = 0;
NODE *redir_exp = NULL;
if (nargs == 0) {
if (do_traditional) {
if (do_lint)
lintwarn(_("printf: no arguments"));
if (redirtype != 0) {
redir_exp = TOP();
if (redir_exp->type != Node_val)
fatal(_("attempt to use array `%s' in a scalar context"), array_vname(redir_exp));
rp = redirect(redir_exp, redirtype, & errflg, true);
DEREF(redir_exp);
decr_sp();
}
return; /* bwk accepts it silently */
}
fatal(_("printf: no arguments"));
}
if (redirtype != 0) {
redir_exp = PEEK(nargs);
if (redir_exp->type != Node_val)
fatal(_("attempt to use array `%s' in a scalar context"), array_vname(redir_exp));
rp = redirect(redir_exp, redirtype, & errflg, true);
if (rp != NULL) {
if ((rp->flag & RED_TWOWAY) != 0 && rp->output.fp == NULL) {
if (is_non_fatal_redirect(redir_exp->stptr, redir_exp->stlen)) {
update_ERRNO_int(EBADF);
return;
}
(void) close_rp(rp, CLOSE_ALL);
fatal(_("printf: attempt to write to closed write end of two-way pipe"));
}
fp = rp->output.fp;
}
else if (errflg) {
update_ERRNO_int(errflg);
return;
}
} else if (do_debug) /* only the debugger can change the default output */
fp = output_fp;
else
fp = stdout;
tmp = printf_common(nargs);
if (redir_exp != NULL) {
DEREF(redir_exp);
decr_sp();
}
if (tmp != NULL) {
if (fp == NULL) {
DEREF(tmp);
return;
}
efwrite(tmp->stptr, sizeof(char), tmp->stlen, fp, "printf", rp, true);
if (rp != NULL && (rp->flag & RED_TWOWAY) != 0)
rp->output.gawk_fflush(rp->output.fp, rp->output.opaque);
DEREF(tmp);
} else
gawk_exit(EXIT_FATAL);
}
/* format_integer_digits --- format just the actual value of an integer. caller frees return value */
static char *
format_integer_digits(NODE *arg, struct flags *flags, bool *used_float)
{
#define VALUE_SIZE 40
char *buf = NULL;
size_t buflen;
static const char lchbuf[] = "0123456789abcdef";
static const char Uchbuf[] = "0123456789ABCDEF";
const char *chbuf;
char *cp;
bool quote_flag = false;
uintmax_t uval;
int i;
double tmpval;
#define growbuffer(buf, buflen, cp) { \
erealloc(buf, char *, buflen * 2); \
cp = buf + buflen; \
buflen *= 2; \
}
#if defined(HAVE_LOCALE_H)
quote_flag = (flags->quote && loc.thousands_sep[0] != '\0');
#endif
emalloc(buf, char *, VALUE_SIZE);
buflen = VALUE_SIZE;
cp = buf;
*used_float = false;
tmpval = double_to_int(arg->numbr);
if (flags->base == 10 && flags->format != 'u') {
// signed decimal
if (tmpval == -0)
tmpval = 0;
/*
* Use snprintf return value to tell if there
* is enough room in the buffer or not.
*/
while ((i = snprintf(buf, buflen, "%.0f", tmpval)) >= buflen) {
if (i > 0)
buflen += (i > buflen) ? i : buflen;
else
buflen *= 2;
assert(buflen > 0);
erealloc(buf, char *, buflen);
}
} else {
// octal or hex or unsigned decimal
chbuf = (flags->format == 'X' ? Uchbuf : lchbuf);
if (tmpval < 0) {
uval = (uintmax_t) (intmax_t) tmpval;
if ((AWKNUM)(intmax_t)uval != double_to_int(tmpval)) {
flags->format = 'g';
free((void *) buf);
*used_float = true;
return format_float(arg, flags);
}
} else {
uval = (uintmax_t) tmpval;
if ((AWKNUM)uval != double_to_int(tmpval)) {
flags->format = 'g';
free((void *) buf);
*used_float = true;
return format_float(arg, flags);
}
}
// generate the digits backwards.
do {
if (cp >= buf + buflen)
growbuffer(buf, buflen, cp);
*cp++ = chbuf[uval % flags->base];
uval /= flags->base;
} while (uval > 0);
*cp = '\0';
// turn it back around
reverse(buf);
}
if (flags->base == 10 && quote_flag) {
char *with_commas = add_thousands(buf);
free((void *) buf);
buf = with_commas;
}
return buf;
}
/* format_signed_integer --- format a signed integer (decimal) value. caller frees return value */
static char *
format_signed_integer(NODE *arg, struct flags *flags)
{
char *number_value;
size_t val_len;
char *buf1 = NULL;
char fill = ' ';
bool used_float = false;
if (out_of_range(arg))
return format_out_of_range(arg, flags);
if (is_mpg_integer(arg) || is_mpg_float(arg))
number_value = format_mpg_integer_digits(arg, flags, & used_float);
else
number_value = format_integer_digits(arg, flags, & used_float); // just digits, possible leading '-'