/
spf_render.c
887 lines (748 loc) · 29.2 KB
/
spf_render.c
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/*
Copyright (C) 2001-2008, The Perl Foundation.
$Id$
=head1 NAME
src/spf_render.c - Parrot sprintf
=head1 DESCRIPTION
Implements the main function that drives the C<Parrot_sprintf> family
and its utility functions.
=head2 Utility Functions
=over 4
=cut
*/
#define IN_SPF_SYSTEM
#include "parrot/parrot.h"
#include "parrot/string_funcs.h"
#include "spf_render.str"
typedef enum {
PHASE_FLAGS = 0,
PHASE_WIDTH,
PHASE_PREC,
PHASE_TYPE,
PHASE_TERM,
PHASE_DONE
} PHASE;
typedef struct SpfInfo_tag {
UINTVAL width;
UINTVAL prec;
INTVAL flags;
INTVAL type;
PHASE phase;
} SpfInfo;
enum {
FLAG_MINUS = (1<<0),
FLAG_PLUS = (1<<1),
FLAG_ZERO = (1<<2),
FLAG_SPACE = (1<<3),
FLAG_SHARP = (1<<4),
FLAG_WIDTH = (1<<5),
FLAG_PREC = (1<<6)
};
/* HEADERIZER HFILE: include/parrot/misc.h */
/* HEADERIZER BEGIN: static */
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
static void gen_sprintf_call(
ARGOUT(char *out),
ARGMOD(SpfInfo *info),
int thingy)
__attribute__nonnull__(1)
__attribute__nonnull__(2)
FUNC_MODIFIES(*out)
FUNC_MODIFIES(*info);
PARROT_CANNOT_RETURN_NULL
static STRING * handle_flags(PARROT_INTERP,
ARGIN(const SpfInfo *info),
ARGMOD(STRING *str),
INTVAL is_int_type,
ARGIN_NULLOK(STRING* prefix))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
__attribute__nonnull__(3)
FUNC_MODIFIES(*str);
PARROT_CANNOT_RETURN_NULL
static STRING* str_append_w_flags(PARROT_INTERP,
ARGOUT(STRING *dest),
ARGIN(const SpfInfo *info),
ARGMOD(STRING *src),
ARGIN_NULLOK(STRING *prefix))
__attribute__nonnull__(1)
__attribute__nonnull__(2)
__attribute__nonnull__(3)
__attribute__nonnull__(4)
FUNC_MODIFIES(*dest)
FUNC_MODIFIES(*src);
/* Don't modify between HEADERIZER BEGIN / HEADERIZER END. Your changes will be lost. */
/* HEADERIZER END: static */
/* Per Dan's orders, we will not use sprintf if snprintf isn't
* around for us.
*/
#ifdef _MSC_VER
# define snprintf _snprintf
#endif
/*
=item C<static STRING * handle_flags>
Handles C<+>, C<->, C<0>, C<#>, space, width, and prec.
=cut
*/
PARROT_CANNOT_RETURN_NULL
static STRING *
handle_flags(PARROT_INTERP, ARGIN(const SpfInfo *info), ARGMOD(STRING *str),
INTVAL is_int_type, ARGIN_NULLOK(STRING* prefix))
{
UINTVAL len = string_length(interp, str);
if (is_int_type) {
if (info->flags & FLAG_PREC && info->prec == 0 &&
len == 1 &&
string_ord(interp, str, 0) == '0') {
string_chopn_inplace(interp, str, len);
len = 0;
}
/* +, space */
if (!len || string_ord(interp, str, 0) != '-') {
if (info->flags & FLAG_PLUS) {
STRING * const cs = CONST_STRING(interp, "+");
str = string_concat(interp, cs, str, 0);
len++;
}
else if (info->flags & FLAG_SPACE) {
STRING * const cs = CONST_STRING(interp, " ");
str = string_concat(interp, cs, str, 0);
len++;
}
}
/* # 0x ... */
if ((info->flags & FLAG_SHARP) && prefix) {
str = string_concat(interp, prefix, str, 0);
len += string_length(interp, prefix);
}
/* XXX sharp + fill ??? */
#if 0
/* precision - only for floats, which is handled elsewhere */
if (info->flags & FLAG_PREC) {
info->flags |= FLAG_WIDTH;
if (string_ord(interp, str, 0) == '-' ||
string_ord(interp, str, 0) == '+') {
info->width = info->prec + 1;
}
else {
info->width = info->prec;
}
}
#endif
}
else {
/* string precision */
if (info->flags & FLAG_PREC && info->prec == 0) {
string_chopn_inplace(interp, str, len);
len = 0;
}
else
if (info->flags & FLAG_PREC && info->prec < len) {
string_chopn_inplace(interp, str, -(INTVAL)(info->prec));
len = info->prec;
}
}
if ((info->flags & FLAG_WIDTH) && info->width > len) {
STRING * const filler =
((info->flags & FLAG_ZERO) && !(info->flags & FLAG_MINUS))
? CONST_STRING(interp, "0")
: CONST_STRING(interp, " ");
STRING * const fill = string_repeat(interp, filler, info->width - len, NULL);
if (info->flags & FLAG_MINUS) { /* left-align */
str = string_concat(interp, str, fill, 0);
}
else { /* right-align */
/* signed and zero padded */
if (info->flags & FLAG_ZERO
&& (string_ord(interp, str, 0) == '-' ||
string_ord(interp, str, 0) == '+')) {
STRING *temp = NULL;
STRING *ignored;
ignored = string_substr(interp, str, 1, len-1, &temp, 0);
UNUSED(ignored);
string_chopn_inplace(interp, str, -1);
str = string_append(interp, str, fill);
str = string_append(interp, str, temp);
}
else {
str = string_concat(interp, fill, str, 0);
}
}
}
return str;
}
/*
=item C<static STRING* str_append_w_flags>
Used by Parrot_sprintf_format. Prepends supplied prefix for numeric
values. (e.g. 0x for hex.)
Returns the pointer to the modified string.
=cut
*/
PARROT_CANNOT_RETURN_NULL
static STRING*
str_append_w_flags(PARROT_INTERP, ARGOUT(STRING *dest), ARGIN(const SpfInfo *info),
ARGMOD(STRING *src), ARGIN_NULLOK(STRING *prefix))
{
src = handle_flags(interp, info, src, 1, prefix);
dest = string_append(interp, dest, src);
return dest;
}
/*
=item C<static void gen_sprintf_call>
Turn the info structure back into an sprintf format. Far from being
pointless, this is used to call C<snprintf()> when we're confronted with
a float.
=cut
*/
static void
gen_sprintf_call(ARGOUT(char *out), ARGMOD(SpfInfo *info), int thingy)
{
int i = 0;
out[i++] = '%';
if (info->flags) {
if (info->flags & FLAG_MINUS)
out[i++] = '-';
if (info->flags & FLAG_PLUS)
out[i++] = '+';
if (info->flags & FLAG_ZERO)
out[i++] = '0';
if (info->flags & FLAG_SPACE)
out[i++] = ' ';
if (info->flags & FLAG_SHARP)
out[i++] = '#';
}
if (info->flags & FLAG_WIDTH) {
if (info->width > PARROT_SPRINTF_BUFFER_SIZE - 1)
info->width = PARROT_SPRINTF_BUFFER_SIZE;
i += sprintf(out + i, "%u", (unsigned)info->width);
}
if (info->flags & FLAG_PREC) {
if (info->prec > PARROT_SPRINTF_MAX_PREC)
info->prec = PARROT_SPRINTF_MAX_PREC;
out[i++] = '.';
i += sprintf(out + i, "%u", (unsigned)info->prec);
}
if (thingy == 'd' || thingy == 'i' ||thingy == 'u') {
/* the u?int isa HUGEU?INTVAL aka long long
* the 'll' modifier is specced in susv3 - hopefully all our
* compilers support it too */
out[i++] = 'l';
out[i++] = 'l';
}
out[i++] = (char)thingy;
out[i] = 0;
}
/*
=item C<STRING * Parrot_sprintf_format>
This is the engine that does all the formatting.
=cut
*/
PARROT_WARN_UNUSED_RESULT
PARROT_CANNOT_RETURN_NULL
STRING *
Parrot_sprintf_format(PARROT_INTERP,
ARGIN(STRING *pat), ARGIN(SPRINTF_OBJ *obj))
{
INTVAL i;
INTVAL len = 0;
INTVAL old = 0;
INTVAL pat_len = (INTVAL)string_length(interp, pat);
HUGEINTVAL num;
/* start with a buffer; double the pattern length to avoid realloc #1 */
STRING *targ = string_make_empty(interp, enum_stringrep_one, pat_len << 1);
/* ts is used almost universally as an intermediate target;
* tc is used as a temporary buffer by uint_to_string and
* as a target by gen_sprintf_call.
*/
STRING *substr = NULL;
char tc[PARROT_SPRINTF_BUFFER_SIZE];
for (i = 0; i < pat_len; i++) {
if (string_ord(interp, pat, i) == '%') { /* % */
if (len) {
STRING *ignored
= string_substr(interp, pat, old, len, &substr, 1);
UNUSED(ignored);
/* XXX This shouldn't modify targ the pointer */
targ = string_append(interp, targ, substr);
}
len = 0;
old = i;
if (string_ord(interp, pat, i + 1) == '%') {
/* skip this one, make next the first char
* of literal sequence, starting at old */
i++;
old++;
len++;
continue;
}
else {
/* hoo boy, here we go... */
HUGEINTVAL sharedint = 0;
/* Storage for flags, etc. */
SpfInfo info = { 0, 0, 0, 0, (PHASE)0 };
/* Reset temporaries */
tc[0] = '\0';
/* This can be really hard to understand, so I'll try to explain beforehand.
* A rough grammar for a printf format is:
*
* grammar Parrot::PrintF_Format {
* rule format {
* <other_stuff> (<field> <other_stuff>)*
* }
*
* rule other_stuff {
* [<[^\%]> | \%\%]*:
* }
*
* rule field {
* \%
* <flags>?
* <width>?
* [\.<prec>]?
* <size>?
* <term>
* }
*
* rule flags {
* <[
* + # prefix with a + if necessary
* - # left-align
* 0 # zero-pad
* <sp> # space-pad
* \# # 0, 0x on octal, hex; force decimal point on float
* ]>+
* }
*
* rule width {
* [\d|\*]+ # minimum width
* }
*
* rule prec {
* [\d|\*]+ # width on integers;
* # number of digits after decimal on floats;
* # maximum width on strings
* }
*
* rule size {
* <[
* h # short (or float)
* l # long
* H # HUGEwhateverVAL (long [long]?, [long]? double)
* v # whateverVAL
* O # opcode_t
* P # really a PMC
* S # Parrot string (only with %s)
* ]>
* }
*
* rule term {
* <[
* c # char
* d # integer
* i # integer
* o # octal
* x # hex
* X # hex with capital X (if #)
* b # binary
* B # binary with capital B (if #)
* u # unsigned integer
* p # pointer
*
* e # 1e1
* E # 1E1
* f # 1.0
* g # 1, 0.1, 1e1
* G # 1, 0.1, 1E1
*
* s # string
* ]>
* }
* }
*
* Complication: once upon a time, %P existed. Now you should
* use %Ps, %Pd or %Pf, but we still need to support the old form.
* The same is true of %S--%Ss is the best form, but %S is still
* supported.
*
* The implementation of Parrot_vsprintf is surprisingly similar to this
* regex, even though the two were developed semi-independently.
* Parrot_vsprintf keeps track of what it expects to see next (the
* 'phase')--flags, width, precision, size, or field type (term). If it
* doesn't find a character that fits whatever it's expecting, it sets
* info.phase to the next thing and tries it. The first four phases just
* set flags--the last does all the work.
*/
for (i++; i < pat_len && info.phase != PHASE_DONE; i++) {
const INTVAL ch = string_ord(interp, pat, i);
switch (info.phase) {
/*@fallthrough@ */ case PHASE_FLAGS:
switch (ch) {
case '-':
info.flags |= FLAG_MINUS;
continue;
case '+':
info.flags |= FLAG_PLUS;
continue;
case '0':
info.flags |= FLAG_ZERO;
continue;
case ' ':
info.flags |= FLAG_SPACE;
continue;
case '#':
info.flags |= FLAG_SHARP;
continue;
default:
info.phase = PHASE_WIDTH;
}
/*@fallthrough@ */ case PHASE_WIDTH:
switch (ch) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
info.flags |= FLAG_WIDTH;
info.width *= 10;
info.width += ch - '0';
continue;
case '*':
info.flags |= FLAG_WIDTH;
num = obj->getint(interp, SIZE_XVAL, obj);
if (num < 0) {
info.flags |= FLAG_MINUS;
info.width = -num;
}
else {
info.width = num;
}
continue;
case '.':
info.phase = PHASE_PREC;
continue;
default:
info.phase = PHASE_PREC;
}
/*@fallthrough@ */ case PHASE_PREC:
switch (ch) {
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
info.flags |= FLAG_PREC;
info.prec *= 10;
info.prec += ch - '0';
continue;
case '*':
info.flags |= FLAG_PREC;
info.prec = (UINTVAL)obj->getint(interp,
SIZE_XVAL, obj);
info.phase = PHASE_TYPE;
continue;
default:
info.phase = PHASE_TYPE;
}
/*@fallthrough@ */ case PHASE_TYPE:
switch (ch) {
case 'h':
info.type = SIZE_SHORT;
continue;
case 'l':
info.type = SIZE_LONG;
continue;
case 'L':
case 'H':
info.type = SIZE_HUGE;
continue;
case 'v':
info.type = SIZE_XVAL;
continue;
case 'O':
info.type = SIZE_OPCODE;
continue;
case 'P':
info.type = SIZE_PMC;
continue;
case 'S':
info.type = SIZE_PSTR;
continue;
default:
info.phase = PHASE_TERM;
}
/*@fallthrough@ */ case PHASE_TERM:
switch (ch) {
/* INTEGERS */
case 'c':
{
STRING * const ts = string_chr(interp,
(UINTVAL)obj->getint(interp, info.type, obj));
targ = str_append_w_flags(interp, targ, &info, ts, NULL);
}
break;
case 'o':
{
const UHUGEINTVAL theuint =
obj->getuint(interp, info.type, obj);
STRING * const ts =
uint_to_str(interp, tc, theuint, 8, 0);
STRING * const prefix = CONST_STRING(interp, "0");
/* unsigned conversion - no plus */
info.flags &= ~FLAG_PLUS;
targ = str_append_w_flags(interp, targ,
&info, ts, prefix);
}
break;
case 'x':
{
const UHUGEINTVAL theuint =
obj->getuint(interp, info.type, obj);
STRING * const ts =
uint_to_str(interp, tc, theuint, 16, 0);
STRING * const prefix = CONST_STRING(interp, "0x");
/* unsigned conversion - no plus */
info.flags &= ~FLAG_PLUS;
targ = str_append_w_flags(interp, targ,
&info, ts, prefix);
}
break;
case 'X':
{
STRING * const prefix = CONST_STRING(interp, "0X");
const UHUGEINTVAL theuint =
obj->getuint(interp, info.type, obj);
STRING * const ts =
uint_to_str(interp, tc, theuint, 16, 0);
string_upcase_inplace(interp, ts);
/* unsigned conversion - no plus */
info.flags &= ~FLAG_PLUS;
targ = str_append_w_flags(interp, targ,
&info, ts, prefix);
}
break;
case 'b':
{
STRING * const prefix = CONST_STRING(interp, "0b");
const UHUGEINTVAL theuint =
obj->getuint(interp, info.type, obj);
STRING * const ts =
uint_to_str(interp, tc, theuint, 2, 0);
/* unsigned conversion - no plus */
info.flags &= ~FLAG_PLUS;
targ = str_append_w_flags(interp, targ,
&info, ts, prefix);
}
break;
case 'B':
{
STRING * const prefix = CONST_STRING(interp, "0B");
const HUGEINTVAL theint =
obj->getint(interp, info.type, obj);
STRING * const ts =
int_to_str(interp, tc, theint, 2);
/* unsigned conversion - no plus */
info.flags &= ~FLAG_PLUS;
targ = str_append_w_flags(interp, targ,
&info, ts, prefix);
}
break;
case 'u':
{
const UHUGEINTVAL theuint =
obj->getuint(interp, info.type, obj);
sharedint = theuint;
}
goto do_sprintf;
case 'd':
case 'i':
/* EVIL: Work around bug in glibc that makes %0lld
* sometimes output an empty string. */
if (!(info.flags & FLAG_WIDTH))
info.flags &= ~FLAG_ZERO;
sharedint = obj->getint(interp, info.type, obj);
do_sprintf:
{
STRING *ts;
gen_sprintf_call(tc, &info, ch);
ts = cstr2pstr(tc);
{
char * const tempstr =
string_to_cstring(interp, ts);
#ifdef PARROT_HAS_SNPRINTF
snprintf(tc, PARROT_SPRINTF_BUFFER_SIZE,
tempstr, sharedint);
#else
/* the buffer is 4096, so no problem here */
sprintf(tc, tempstr, sharedint);
#endif
string_cstring_free(tempstr);
}
targ = string_append(interp, targ, cstr2pstr(tc));
}
break;
case 'p':
{
STRING * const prefix = CONST_STRING(interp, "0x");
const void * const ptr =
obj->getptr(interp, info.type, obj);
STRING * const ts = uint_to_str(interp, tc,
(UHUGEINTVAL) (size_t) ptr, 16, 0);
targ = str_append_w_flags(interp, targ, &info,
ts, prefix);
}
break;
/* FLOATS - We cheat on these and use snprintf. */
case 'e':
case 'E':
case 'f':
case 'g':
case 'G':
{
STRING *ts;
const HUGEFLOATVAL thefloat =
obj->getfloat(interp, info.type, obj);
/* turn -0.0 into 0.0 */
gen_sprintf_call(tc, &info, ch);
ts = cstr2pstr(tc);
/* XXX lost precision if %Hg or whatever */
{
char * const tempstr =
string_to_cstring(interp, ts);
#ifdef PARROT_HAS_SNPRINTF
snprintf(tc, PARROT_SPRINTF_BUFFER_SIZE,
tempstr,
(double)thefloat);
#else
/* the buffer is 4096, so no problem here */
sprintf(tc, tempstr, (double)thefloat);
#endif
string_cstring_free(tempstr);
}
#ifdef WIN32
/* Microsoft defaults to three digits for
* exponents, even when fewer digits would suffice.
* For the sake of portability, we will here
* attempt to hide that. */
if (ch == 'g' || ch == 'G'
|| ch == 'e' || ch == 'E') {
const size_t tclen = strlen(tc);
size_t j;
for (j = 0; j < tclen; j++) {
if ((tc[j] == 'e' || tc[j] == 'E')
&& (tc[j+1] == '+' || tc[j+1] == '-')
&& tc[j+2] == '0'
&& isdigit((unsigned char)tc[j+3])
&& isdigit((unsigned char)tc[j+4]))
{
mem_sys_memmove(&tc[j+2], &tc[j+3],
strlen(&tc[j+2]));
/* now fix any broken length */
if ((info.flags & FLAG_WIDTH)
&& strlen(tc) < info.width) {
if (info.flags & FLAG_MINUS)
strcat(tc, " ");
else {
mem_sys_memmove(&tc[1], &tc[0],
strlen(tc) + 1);
tc[0] = (info.flags & FLAG_ZERO) ? '0' : ' ';
}
}
/* only one fix required per string */
break;
}
}
}
#endif /* WIN32 */
targ = string_append(interp, targ, cstr2pstr(tc));
}
break;
/* STRINGS */
case 'r': /* Python repr */
/* XXX the right fix is to add a getrepr entry *
* to SPRINTF_OBJ, but for now, getstring_pmc *
* is inlined and modified to call get_repr */
if (obj->getstring == pmc_core.getstring) {
PMC * const tmp =
VTABLE_get_pmc_keyed_int(interp,
((PMC *)obj->data),
(obj->index));
STRING *string = (VTABLE_get_repr(interp, tmp));
STRING *ts = handle_flags(interp, &info,
string, 0, NULL);
obj->index++;
targ = string_append(interp, targ, ts);
break;
}
case 's':
CASE_s:
{
STRING * const string = obj->getstring(interp,
info.type, obj);
STRING * const ts = handle_flags(interp, &info,
string, 0, NULL);
targ = string_append(interp, targ, ts);
}
break;
default:
/* fake the old %P and %S commands */
if (info.type == SIZE_PMC
|| info.type == SIZE_PSTR) {
i--;
goto CASE_s;
/* case 's' will see the SIZE_PMC or SIZE_PSTR
* and assume it was %Ps (or %Ss). Genius,
* no? */
}
else {
Parrot_ex_throw_from_c_args(interp, NULL,
EXCEPTION_INVALID_CHARACTER,
"'%c' is not a valid sprintf format", ch);
}
}
info.phase = PHASE_DONE;
break;
case PHASE_DONE:
default:
/* This is the terminating condition of the surrounding
* loop, so...
*/
PANIC(interp, "We can't be here");
}
}
}
old = i;
i--;
}
else {
len++;
}
}
if (len) {
STRING *ignored = string_substr(interp, pat, old, len, &substr, 1);
UNUSED(ignored);
targ = string_append(interp, targ, substr);
}
return targ;
}
/*
=back
=head1 SEE ALSO
F<src/misc.h>, F<src/misc.c>, F<src/spf_vtable.c>.
=cut
*/
/*
* Local variables:
* c-file-style: "parrot"
* End:
* vim: expandtab shiftwidth=4:
*/