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Introduce float4in_internal

Browse Source 
This is the guts of float4in, callable as a routine to input floats,
which will be useful in an upcoming patch for allowing soft errors in
the seg module's input function.

A similar operation was performed some years ago for float8in in
commit 50861cd683.

Reviewed by Tom Lane

Discussion: https://postgr.es/m/cee4e426-d014-c0b7-aa22-a659f2cd9130@dunslane.net
This commit is contained in:
Andrew Dunstan 2022-12-21 08:37:17 -05:00
parent eb706fde83
commit 33dd895ef3
2 changed files with 45 additions and 15 deletions
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57
src/backend/utils/adt/float.c
View File

@ -163,17 +163,35 @@ Datum
float4in(PG_FUNCTION_ARGS)
{
char *num = PG_GETARG_CSTRING(0);
Node *escontext = fcinfo->context;
char *orig_num;
PG_RETURN_FLOAT4(float4in_internal(num, NULL, "real", num,
fcinfo->context));
}
/*
* float4in_internal - guts of float4in()
*
* This is exposed for use by functions that want a reasonably
* platform-independent way of inputting floats. The behavior is
* essentially like strtof + ereturn on error.
*
* Uses the same API as float8in_internal below, so most of its
* comments also apply here, except regarding use in geometric types.
*/
float4
float4in_internal(char *num, char **endptr_p,
const char *type_name, const char *orig_string,
struct Node *escontext)
{
float val;
char *endptr;
/*
* endptr points to the first character _after_ the sequence we recognized
* as a valid floating point number. orig_num points to the original input
* as a valid floating point number. orig_string points to the original
* input
* string.
*/
orig_num = num;
/* skip leading whitespace */
while (*num != '\0' && isspace((unsigned char) *num))
@ -184,10 +202,10 @@ float4in(PG_FUNCTION_ARGS)
* strtod() on different platforms.
*/
if (*num == '\0')
ereturn(escontext, (Datum) 0,
ereturn(escontext, 0,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type %s: \"%s\"",
"real", orig_num)));
type_name, orig_string)));
errno = 0;
val = strtof(num, &endptr);
@ -258,30 +276,39 @@ float4in(PG_FUNCTION_ARGS)
(val >= HUGE_VALF || val <= -HUGE_VALF)
#endif
)
ereturn(escontext, (Datum) 0,
{
/* see comments in float8in_internal for rationale */
char *errnumber = pstrdup(num);
errnumber[endptr - num] = '\0';
ereturn(escontext, 0,
(errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
errmsg("\"%s\" is out of range for type real",
orig_num)));
errnumber)));
}
}
else
ereturn(escontext, (Datum) 0,
ereturn(escontext, 0,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type %s: \"%s\"",
"real", orig_num)));
type_name, orig_string)));
}
/* skip trailing whitespace */
while (*endptr != '\0' && isspace((unsigned char) *endptr))
endptr++;
/* if there is any junk left at the end of the string, bail out */
if (*endptr != '\0')
ereturn(escontext, (Datum) 0,
/* report stopping point if wanted, else complain if not end of string */
if (endptr_p)
*endptr_p = endptr;
else if (*endptr != '\0')
ereturn(escontext, 0,
(errcode(ERRCODE_INVALID_TEXT_REPRESENTATION),
errmsg("invalid input syntax for type %s: \"%s\"",
"real", orig_num)));
type_name, orig_string)));
PG_RETURN_FLOAT4(val);
return val;
}
/*

3
src/include/utils/float.h
View File

@ -44,6 +44,9 @@ extern int is_infinite(float8 val);
extern float8 float8in_internal(char *num, char **endptr_p,
const char *type_name, const char *orig_string,
struct Node *escontext);
extern float4 float4in_internal(char *num, char **endptr_p,
const char *type_name, const char *orig_string,
struct Node *escontext);
extern char *float8out_internal(float8 num);
extern int float4_cmp_internal(float4 a, float4 b);
extern int float8_cmp_internal(float8 a, float8 b);