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Rename C variables in formatting.c, for clarity

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Also add C comments.  This should help future debugging of this
notorious file.
This commit is contained in:
Bruce Momjian 2014-09-05 09:52:31 -04:00
parent 303f4d1012
commit a9c22d1480
1 changed files with 103 additions and 88 deletions
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191
src/backend/utils/adt/formatting.c
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@ -917,7 +917,7 @@ typedef struct NUMProc
num_count, /* number of write digits */ num_count, /* number of write digits */
num_in, /* is inside number */ num_in, /* is inside number */
num_curr, /* current position in number */ num_curr, /* current position in number */
num_pre, /* space before first number */ out_pre_spaces, /* spaces before first digit */
read_dec, /* to_number - was read dec. point */ read_dec, /* to_number - was read dec. point */
read_post, /* to_number - number of dec. digit */ read_post, /* to_number - number of dec. digit */
@ -975,10 +975,11 @@ static FormatNode *NUM_cache(int len, NUMDesc *Num, text *pars_str, bool *should
static char *int_to_roman(int number); static char *int_to_roman(int number);
static void NUM_prepare_locale(NUMProc *Np); static void NUM_prepare_locale(NUMProc *Np);
static char *get_last_relevant_decnum(char *num); static char *get_last_relevant_decnum(char *num);
static void NUM_numpart_from_char(NUMProc *Np, int id, int plen); static void NUM_numpart_from_char(NUMProc *Np, int id, int input_len);
static void NUM_numpart_to_char(NUMProc *Np, int id); static void NUM_numpart_to_char(NUMProc *Np, int id);
static char *NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number, static char *NUM_processor(FormatNode *node, NUMDesc *Num, char *inout,
int plen, int sign, bool is_to_char, Oid collid); char *number, int from_char_input_len, int to_char_out_pre_spaces,
int sign, bool is_to_char, Oid collid);
static DCHCacheEntry *DCH_cache_search(char *str); static DCHCacheEntry *DCH_cache_search(char *str);
static DCHCacheEntry *DCH_cache_getnew(char *str); static DCHCacheEntry *DCH_cache_getnew(char *str);
@ -4054,7 +4055,7 @@ get_last_relevant_decnum(char *num)
* ---------- * ----------
*/ */
static void static void
NUM_numpart_from_char(NUMProc *Np, int id, int plen) NUM_numpart_from_char(NUMProc *Np, int id, int input_len)
{ {
bool isread = FALSE; bool isread = FALSE;
@ -4066,8 +4067,8 @@ NUM_numpart_from_char(NUMProc *Np, int id, int plen)
if (*Np->inout_p == ' ') if (*Np->inout_p == ' ')
Np->inout_p++; Np->inout_p++;
#define OVERLOAD_TEST (Np->inout_p >= Np->inout + plen) #define OVERLOAD_TEST (Np->inout_p >= Np->inout + input_len)
#define AMOUNT_TEST(_s) (plen-(Np->inout_p-Np->inout) >= _s) #define AMOUNT_TEST(_s) (input_len-(Np->inout_p-Np->inout) >= _s)
if (*Np->inout_p == ' ') if (*Np->inout_p == ' ')
Np->inout_p++; Np->inout_p++;
@ -4206,7 +4207,7 @@ NUM_numpart_from_char(NUMProc *Np, int id, int plen)
* next char is not digit * next char is not digit
*/ */
if (IS_LSIGN(Np->Num) && isread && if (IS_LSIGN(Np->Num) && isread &&
(Np->inout_p + 1) <= Np->inout + plen && (Np->inout_p + 1) <= Np->inout + input_len &&
!isdigit((unsigned char) *(Np->inout_p + 1))) !isdigit((unsigned char) *(Np->inout_p + 1)))
{ {
int x; int x;
@ -4301,7 +4302,7 @@ NUM_numpart_to_char(NUMProc *Np, int id)
* handle "9.9" --> " .1" * handle "9.9" --> " .1"
*/ */
if (Np->sign_wrote == FALSE && if (Np->sign_wrote == FALSE &&
(Np->num_curr >= Np->num_pre || (IS_ZERO(Np->Num) && Np->Num->zero_start == Np->num_curr)) && (Np->num_curr >= Np->out_pre_spaces || (IS_ZERO(Np->Num) && Np->Num->zero_start == Np->num_curr)) &&
(IS_PREDEC_SPACE(Np) == FALSE || (Np->last_relevant && *Np->last_relevant == '.'))) (IS_PREDEC_SPACE(Np) == FALSE || (Np->last_relevant && *Np->last_relevant == '.')))
{ {
if (IS_LSIGN(Np->Num)) if (IS_LSIGN(Np->Num))
@ -4345,7 +4346,7 @@ NUM_numpart_to_char(NUMProc *Np, int id)
*/ */
if (id == NUM_9 || id == NUM_0 || id == NUM_D || id == NUM_DEC) if (id == NUM_9 || id == NUM_0 || id == NUM_D || id == NUM_DEC)
{ {
if (Np->num_curr < Np->num_pre && if (Np->num_curr < Np->out_pre_spaces &&
(Np->Num->zero_start > Np->num_curr || !IS_ZERO(Np->Num))) (Np->Num->zero_start > Np->num_curr || !IS_ZERO(Np->Num)))
{ {
/* /*
@ -4358,7 +4359,7 @@ NUM_numpart_to_char(NUMProc *Np, int id)
} }
} }
else if (IS_ZERO(Np->Num) && else if (IS_ZERO(Np->Num) &&
Np->num_curr < Np->num_pre && Np->num_curr < Np->out_pre_spaces &&
Np->Num->zero_start <= Np->num_curr) Np->Num->zero_start <= Np->num_curr)
{ {
/* /*
@ -4430,7 +4431,7 @@ NUM_numpart_to_char(NUMProc *Np, int id)
++Np->number_p; ++Np->number_p;
} }
end = Np->num_count + (Np->num_pre ? 1 : 0) + (IS_DECIMAL(Np->Num) ? 1 : 0); end = Np->num_count + (Np->out_pre_spaces ? 1 : 0) + (IS_DECIMAL(Np->Num) ? 1 : 0);
if (Np->last_relevant && Np->last_relevant == Np->number_p) if (Np->last_relevant && Np->last_relevant == Np->number_p)
end = Np->num_curr; end = Np->num_curr;
@ -4456,13 +4457,10 @@ NUM_numpart_to_char(NUMProc *Np, int id)
++Np->num_curr; ++Np->num_curr;
} }
/*
* Note: 'plen' is used in FROM_CHAR conversion and it's length of
* input (inout). In TO_CHAR conversion it's space before first number.
*/
static char * static char *
NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number, NUM_processor(FormatNode *node, NUMDesc *Num, char *inout,
int plen, int sign, bool is_to_char, Oid collid) char *number, int from_char_input_len, int to_char_out_pre_spaces,
int sign, bool is_to_char, Oid collid)
{ {
FormatNode *n; FormatNode *n;
NUMProc _Np, NUMProc _Np,
@ -4502,7 +4500,7 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
errmsg("\"RN\" not supported for input"))); errmsg("\"RN\" not supported for input")));
Np->Num->lsign = Np->Num->pre_lsign_num = Np->Num->post = Np->Num->lsign = Np->Num->pre_lsign_num = Np->Num->post =
Np->Num->pre = Np->num_pre = Np->sign = 0; Np->Num->pre = Np->out_pre_spaces = Np->sign = 0;
if (IS_FILLMODE(Np->Num)) if (IS_FILLMODE(Np->Num))
{ {
@ -4560,7 +4558,7 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
if (is_to_char) if (is_to_char)
{ {
Np->num_pre = plen; Np->out_pre_spaces = to_char_out_pre_spaces;
if (IS_FILLMODE(Np->Num) && IS_DECIMAL(Np->Num)) if (IS_FILLMODE(Np->Num) && IS_DECIMAL(Np->Num))
{ {
@ -4570,22 +4568,22 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
* If any '0' specifiers are present, make sure we don't strip * If any '0' specifiers are present, make sure we don't strip
* those digits. * those digits.
*/ */
if (Np->last_relevant && Np->Num->zero_end > Np->num_pre) if (Np->last_relevant && Np->Num->zero_end > Np->out_pre_spaces)
{ {
char *last_zero; char *last_zero;
last_zero = Np->number + (Np->Num->zero_end - Np->num_pre); last_zero = Np->number + (Np->Num->zero_end - Np->out_pre_spaces);
if (Np->last_relevant < last_zero) if (Np->last_relevant < last_zero)
Np->last_relevant = last_zero; Np->last_relevant = last_zero;
} }
} }
if (Np->sign_wrote == FALSE && Np->num_pre == 0) if (Np->sign_wrote == FALSE && Np->out_pre_spaces == 0)
++Np->num_count; ++Np->num_count;
} }
else else
{ {
Np->num_pre = 0; Np->out_pre_spaces = 0;
*Np->number = ' '; /* sign space */ *Np->number = ' '; /* sign space */
*(Np->number + 1) = '\0'; *(Np->number + 1) = '\0';
} }
@ -4601,7 +4599,7 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
Np->Num->pre, Np->Num->pre,
Np->Num->post, Np->Num->post,
Np->num_count, Np->num_count,
Np->num_pre, Np->out_pre_spaces,
Np->sign_wrote ? "Yes" : "No", Np->sign_wrote ? "Yes" : "No",
IS_ZERO(Np->Num) ? "Yes" : "No", IS_ZERO(Np->Num) ? "Yes" : "No",
Np->Num->zero_start, Np->Num->zero_start,
@ -4636,7 +4634,7 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
/* /*
* Check non-string inout end * Check non-string inout end
*/ */
if (Np->inout_p >= Np->inout + plen) if (Np->inout_p >= Np->inout + from_char_input_len)
break; break;
} }
@ -4666,7 +4664,7 @@ NUM_processor(FormatNode *node, NUMDesc *Num, char *inout, char *number,
} }
else else
{ {
NUM_numpart_from_char(Np, n->key->id, plen); NUM_numpart_from_char(Np, n->key->id, from_char_input_len);
break; /* switch() case: */ break; /* switch() case: */
} }
@ -4891,7 +4889,7 @@ do { \
do { \ do { \
int len; \ int len; \
\ \
NUM_processor(format, &Num, VARDATA(result), numstr, plen, sign, true, PG_GET_COLLATION()); \ NUM_processor(format, &Num, VARDATA(result), numstr, 0, out_pre_spaces, sign, true, PG_GET_COLLATION()); \
\ \
if (shouldFree) \ if (shouldFree) \
pfree(format); \ pfree(format); \
@ -4933,7 +4931,7 @@ numeric_to_number(PG_FUNCTION_ARGS)
numstr = (char *) palloc((len * NUM_MAX_ITEM_SIZ) + 1); numstr = (char *) palloc((len * NUM_MAX_ITEM_SIZ) + 1);
NUM_processor(format, &Num, VARDATA(value), numstr, NUM_processor(format, &Num, VARDATA(value), numstr,
VARSIZE(value) - VARHDRSZ, 0, false, PG_GET_COLLATION()); VARSIZE(value) - VARHDRSZ, 0, 0, false, PG_GET_COLLATION());
scale = Num.post; scale = Num.post;
precision = Max(0, Num.pre) + scale; precision = Max(0, Num.pre) + scale;
@ -4962,7 +4960,7 @@ numeric_to_char(PG_FUNCTION_ARGS)
FormatNode *format; FormatNode *format;
text *result; text *result;
bool shouldFree; bool shouldFree;
int plen = 0, int out_pre_spaces = 0,
sign = 0; sign = 0;
char *numstr, char *numstr,
*orgnum, *orgnum,
@ -5016,7 +5014,7 @@ numeric_to_char(PG_FUNCTION_ARGS)
} }
else else
{ {
int len; int numstr_pre_len;
Numeric val = value; Numeric val = value;
if (IS_MULTI(&Num)) if (IS_MULTI(&Num))
@ -5051,14 +5049,17 @@ numeric_to_char(PG_FUNCTION_ARGS)
sign = '+'; sign = '+';
numstr = orgnum; numstr = orgnum;
} }
if ((p = strchr(numstr, '.')))
len = p - numstr;
else
len = strlen(numstr);
if (Num.pre > len) if ((p = strchr(numstr, '.')))
plen = Num.pre - len; numstr_pre_len = p - numstr;
else if (len > Num.pre) else
numstr_pre_len = strlen(numstr);
/* needs padding? */
if (numstr_pre_len < Num.pre)
out_pre_spaces = Num.pre - numstr_pre_len;
/* overflowed prefix digit format? */
else if (numstr_pre_len > Num.pre)
{ {
numstr = (char *) palloc(Num.pre + Num.post + 2); numstr = (char *) palloc(Num.pre + Num.post + 2);
fill_str(numstr, '#', Num.pre + Num.post + 1); fill_str(numstr, '#', Num.pre + Num.post + 1);
@ -5083,7 +5084,7 @@ int4_to_char(PG_FUNCTION_ARGS)
FormatNode *format; FormatNode *format;
text *result; text *result;
bool shouldFree; bool shouldFree;
int plen = 0, int out_pre_spaces = 0,
sign = 0; sign = 0;
char *numstr, char *numstr,
*orgnum; *orgnum;
@ -5113,7 +5114,7 @@ int4_to_char(PG_FUNCTION_ARGS)
} }
else else
{ {
int len; int numstr_pre_len;
if (IS_MULTI(&Num)) if (IS_MULTI(&Num))
{ {
@ -5134,22 +5135,26 @@ int4_to_char(PG_FUNCTION_ARGS)
} }
else else
sign = '+'; sign = '+';
len = strlen(orgnum);
numstr_pre_len = strlen(orgnum);
/* post-decimal digits? Pad out with zeros. */
if (Num.post) if (Num.post)
{ {
numstr = (char *) palloc(len + Num.post + 2); numstr = (char *) palloc(numstr_pre_len + Num.post + 2);
strcpy(numstr, orgnum); strcpy(numstr, orgnum);
*(numstr + len) = '.'; *(numstr + numstr_pre_len) = '.';
memset(numstr + len + 1, '0', Num.post); memset(numstr + numstr_pre_len + 1, '0', Num.post);
*(numstr + len + Num.post + 1) = '\0'; *(numstr + numstr_pre_len + Num.post + 1) = '\0';
} }
else else
numstr = orgnum; numstr = orgnum;
if (Num.pre > len) /* needs padding? */
plen = Num.pre - len; if (numstr_pre_len < Num.pre)
else if (len > Num.pre) out_pre_spaces = Num.pre - numstr_pre_len;
/* overflowed prefix digit format? */
else if (numstr_pre_len > Num.pre)
{ {
numstr = (char *) palloc(Num.pre + Num.post + 2); numstr = (char *) palloc(Num.pre + Num.post + 2);
fill_str(numstr, '#', Num.pre + Num.post + 1); fill_str(numstr, '#', Num.pre + Num.post + 1);
@ -5174,7 +5179,7 @@ int8_to_char(PG_FUNCTION_ARGS)
FormatNode *format; FormatNode *format;
text *result; text *result;
bool shouldFree; bool shouldFree;
int plen = 0, int out_pre_spaces = 0,
sign = 0; sign = 0;
char *numstr, char *numstr,
*orgnum; *orgnum;
@ -5217,7 +5222,7 @@ int8_to_char(PG_FUNCTION_ARGS)
} }
else else
{ {
int len; int numstr_pre_len;
if (IS_MULTI(&Num)) if (IS_MULTI(&Num))
{ {
@ -5240,22 +5245,26 @@ int8_to_char(PG_FUNCTION_ARGS)
} }
else else
sign = '+'; sign = '+';
len = strlen(orgnum);
numstr_pre_len = strlen(orgnum);
/* post-decimal digits? Pad out with zeros. */
if (Num.post) if (Num.post)
{ {
numstr = (char *) palloc(len + Num.post + 2); numstr = (char *) palloc(numstr_pre_len + Num.post + 2);
strcpy(numstr, orgnum); strcpy(numstr, orgnum);
*(numstr + len) = '.'; *(numstr + numstr_pre_len) = '.';
memset(numstr + len + 1, '0', Num.post); memset(numstr + numstr_pre_len + 1, '0', Num.post);
*(numstr + len + Num.post + 1) = '\0'; *(numstr + numstr_pre_len + Num.post + 1) = '\0';
} }
else else
numstr = orgnum; numstr = orgnum;
if (Num.pre > len) /* needs padding? */
plen = Num.pre - len; if (numstr_pre_len < Num.pre)
else if (len > Num.pre) out_pre_spaces = Num.pre - numstr_pre_len;
/* overflowed prefix digit format? */
else if (numstr_pre_len > Num.pre)
{ {
numstr = (char *) palloc(Num.pre + Num.post + 2); numstr = (char *) palloc(Num.pre + Num.post + 2);
fill_str(numstr, '#', Num.pre + Num.post + 1); fill_str(numstr, '#', Num.pre + Num.post + 1);
@ -5280,7 +5289,7 @@ float4_to_char(PG_FUNCTION_ARGS)
FormatNode *format; FormatNode *format;
text *result; text *result;
bool shouldFree; bool shouldFree;
int plen = 0, int out_pre_spaces = 0,
sign = 0; sign = 0;
char *numstr, char *numstr,
*orgnum, *orgnum,
@ -5320,7 +5329,7 @@ float4_to_char(PG_FUNCTION_ARGS)
else else
{ {
float4 val = value; float4 val = value;
int len; int numstr_pre_len;
if (IS_MULTI(&Num)) if (IS_MULTI(&Num))
{ {
@ -5332,13 +5341,13 @@ float4_to_char(PG_FUNCTION_ARGS)
orgnum = (char *) palloc(MAXFLOATWIDTH + 1); orgnum = (char *) palloc(MAXFLOATWIDTH + 1);
snprintf(orgnum, MAXFLOATWIDTH + 1, "%.0f", fabs(val)); snprintf(orgnum, MAXFLOATWIDTH + 1, "%.0f", fabs(val));
len = strlen(orgnum); numstr_pre_len = strlen(orgnum);
if (Num.pre > len)
plen = Num.pre - len; /* adjust post digits to fit max float digits */
if (len >= FLT_DIG) if (numstr_pre_len >= FLT_DIG)
Num.post = 0; Num.post = 0;
else if (Num.post + len > FLT_DIG) else if (numstr_pre_len + Num.post > FLT_DIG)
Num.post = FLT_DIG - len; Num.post = FLT_DIG - numstr_pre_len;
snprintf(orgnum, MAXFLOATWIDTH + 1, "%.*f", Num.post, val); snprintf(orgnum, MAXFLOATWIDTH + 1, "%.*f", Num.post, val);
if (*orgnum == '-') if (*orgnum == '-')
@ -5351,14 +5360,17 @@ float4_to_char(PG_FUNCTION_ARGS)
sign = '+'; sign = '+';
numstr = orgnum; numstr = orgnum;
} }
if ((p = strchr(numstr, '.')))
len = p - numstr;
else
len = strlen(numstr);
if (Num.pre > len) if ((p = strchr(numstr, '.')))
plen = Num.pre - len; numstr_pre_len = p - numstr;
else if (len > Num.pre) else
numstr_pre_len = strlen(numstr);
/* needs padding? */
if (numstr_pre_len < Num.pre)
out_pre_spaces = Num.pre - numstr_pre_len;
/* overflowed prefix digit format? */
else if (numstr_pre_len > Num.pre)
{ {
numstr = (char *) palloc(Num.pre + Num.post + 2); numstr = (char *) palloc(Num.pre + Num.post + 2);
fill_str(numstr, '#', Num.pre + Num.post + 1); fill_str(numstr, '#', Num.pre + Num.post + 1);
@ -5383,7 +5395,7 @@ float8_to_char(PG_FUNCTION_ARGS)
FormatNode *format; FormatNode *format;
text *result; text *result;
bool shouldFree; bool shouldFree;
int plen = 0, int out_pre_spaces = 0,
sign = 0; sign = 0;
char *numstr, char *numstr,
*orgnum, *orgnum,
@ -5423,7 +5435,7 @@ float8_to_char(PG_FUNCTION_ARGS)
else else
{ {
float8 val = value; float8 val = value;
int len; int numstr_pre_len;
if (IS_MULTI(&Num)) if (IS_MULTI(&Num))
{ {
@ -5433,13 +5445,13 @@ float8_to_char(PG_FUNCTION_ARGS)
Num.pre += Num.multi; Num.pre += Num.multi;
} }
orgnum = (char *) palloc(MAXDOUBLEWIDTH + 1); orgnum = (char *) palloc(MAXDOUBLEWIDTH + 1);
len = snprintf(orgnum, MAXDOUBLEWIDTH + 1, "%.0f", fabs(val)); numstr_pre_len = snprintf(orgnum, MAXDOUBLEWIDTH + 1, "%.0f", fabs(val));
if (Num.pre > len)
plen = Num.pre - len; /* adjust post digits to fit max double digits */
if (len >= DBL_DIG) if (numstr_pre_len >= DBL_DIG)
Num.post = 0; Num.post = 0;
else if (Num.post + len > DBL_DIG) else if (numstr_pre_len + Num.post > DBL_DIG)
Num.post = DBL_DIG - len; Num.post = DBL_DIG - numstr_pre_len;
snprintf(orgnum, MAXDOUBLEWIDTH + 1, "%.*f", Num.post, val); snprintf(orgnum, MAXDOUBLEWIDTH + 1, "%.*f", Num.post, val);
if (*orgnum == '-') if (*orgnum == '-')
@ -5452,14 +5464,17 @@ float8_to_char(PG_FUNCTION_ARGS)
sign = '+'; sign = '+';
numstr = orgnum; numstr = orgnum;
} }
if ((p = strchr(numstr, '.')))
len = p - numstr;
else
len = strlen(numstr);
if (Num.pre > len) if ((p = strchr(numstr, '.')))
plen = Num.pre - len; numstr_pre_len = p - numstr;
else if (len > Num.pre) else
numstr_pre_len = strlen(numstr);
/* needs padding? */
if (numstr_pre_len < Num.pre)
out_pre_spaces = Num.pre - numstr_pre_len;
/* overflowed prefix digit format? */
else if (numstr_pre_len > Num.pre)
{ {
numstr = (char *) palloc(Num.pre + Num.post + 2); numstr = (char *) palloc(Num.pre + Num.post + 2);
fill_str(numstr, '#', Num.pre + Num.post + 1); fill_str(numstr, '#', Num.pre + Num.post + 1);