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Add comments about why errno is set to zero.

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This commit is contained in:
Bruce Momjian
2005-12-01 20:06:37 +00:00
parent 814acfcc3a
commit 277b2ea328
2 changed files with 24 additions and 24 deletions
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26
src/backend/utils/adt/float.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.116 2005/11/17 22:14:52 tgl Exp $
* $PostgreSQL: pgsql/src/backend/utils/adt/float.c,v 1.117 2005/12/01 20:06:37 momjian Exp $
*
*-------------------------------------------------------------------------
*/
@ -278,7 +278,7 @@ float4in(PG_FUNCTION_ARGS)
while (*num != '\0' && isspace((unsigned char) *num))
num++;
errno = 0;
errno = 0; /* avoid checking HUGE_VAL */
val = strtod(num, &endptr);
/* did we not see anything that looks like a double? */
@ -445,7 +445,7 @@ float8in(PG_FUNCTION_ARGS)
while (*num != '\0' && isspace((unsigned char) *num))
num++;
errno = 0;
errno = 0; /* avoid checking HUGE_VAL */
val = strtod(num, &endptr);
/* did we not see anything that looks like a double? */
@ -1476,7 +1476,7 @@ dpow(PG_FUNCTION_ARGS)
* We must check both for errno getting set and for a NaN result, in order
* to deal with the vagaries of different platforms...
*/
errno = 0;
errno = 0; /* avoid checking result for failure */
result = pow(arg1, arg2);
if (errno != 0
#ifdef HAVE_FINITE
@ -1506,7 +1506,7 @@ dexp(PG_FUNCTION_ARGS)
* to deal with the vagaries of different platforms. Also, a zero result
* implies unreported underflow.
*/
errno = 0;
errno = 0; /* avoid checking result for failure */
result = exp(arg1);
if (errno != 0 || result == 0.0
#ifdef HAVE_FINITE
@ -1590,7 +1590,7 @@ dacos(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = acos(arg1);
if (errno != 0
#ifdef HAVE_FINITE
@ -1615,7 +1615,7 @@ dasin(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = asin(arg1);
if (errno != 0
#ifdef HAVE_FINITE
@ -1640,7 +1640,7 @@ datan(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = atan(arg1);
if (errno != 0
#ifdef HAVE_FINITE
@ -1666,7 +1666,7 @@ datan2(PG_FUNCTION_ARGS)
float8 arg2 = PG_GETARG_FLOAT8(1);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = atan2(arg1, arg2);
if (errno != 0
#ifdef HAVE_FINITE
@ -1691,7 +1691,7 @@ dcos(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = cos(arg1);
if (errno != 0
#ifdef HAVE_FINITE
@ -1716,7 +1716,7 @@ dcot(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = tan(arg1);
if (errno != 0 || result == 0.0
#ifdef HAVE_FINITE
@ -1742,7 +1742,7 @@ dsin(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = sin(arg1);
if (errno != 0
#ifdef HAVE_FINITE
@ -1767,7 +1767,7 @@ dtan(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result;
errno = 0;
errno = 0; /* avoid checking result for failure */
result = tan(arg1);
if (errno != 0
#ifdef HAVE_FINITE