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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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22
src/backend/utils/adt/datetime.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.162 2005/12/01 17:56:34 tgl Exp $ * $PostgreSQL: pgsql/src/backend/utils/adt/datetime.c,v 1.163 2005/12/01 20:06:37 momjian Exp $
* *
*------------------------------------------------------------------------- *-------------------------------------------------------------------------
*/ */
@ -1013,7 +1013,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
if (tzp == NULL) if (tzp == NULL)
return DTERR_BAD_FORMAT; return DTERR_BAD_FORMAT;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
val = strtol(field[i], &cp, 10); val = strtol(field[i], &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
@ -1161,7 +1161,7 @@ DecodeDateTime(char **field, int *ftype, int nf,
char *cp; char *cp;
int val; int val;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
val = strtol(field[i], &cp, 10); val = strtol(field[i], &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
@ -1921,7 +1921,7 @@ DecodeTimeOnly(char **field, int *ftype, int nf,
break; break;
} }
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
val = strtol(field[i], &cp, 10); val = strtol(field[i], &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
@ -2465,14 +2465,14 @@ DecodeTime(char *str, int fmask, int *tmask, struct pg_tm * tm, fsec_t *fsec)
*tmask = DTK_TIME_M; *tmask = DTK_TIME_M;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
tm->tm_hour = strtol(str, &cp, 10); tm->tm_hour = strtol(str, &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
if (*cp != ':') if (*cp != ':')
return DTERR_BAD_FORMAT; return DTERR_BAD_FORMAT;
str = cp + 1; str = cp + 1;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
tm->tm_min = strtol(str, &cp, 10); tm->tm_min = strtol(str, &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
@ -2486,7 +2486,7 @@ DecodeTime(char *str, int fmask, int *tmask, struct pg_tm * tm, fsec_t *fsec)
else else
{ {
str = cp + 1; str = cp + 1;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
tm->tm_sec = strtol(str, &cp, 10); tm->tm_sec = strtol(str, &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
@ -2540,7 +2540,7 @@ DecodeNumber(int flen, char *str, bool haveTextMonth, int fmask,
*tmask = 0; *tmask = 0;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
val = strtol(str, &cp, 10); val = strtol(str, &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;
@ -2830,7 +2830,7 @@ DecodeTimezone(char *str, int *tzp)
if (*str != '+' && *str != '-') if (*str != '+' && *str != '-')
return DTERR_BAD_FORMAT; return DTERR_BAD_FORMAT;
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
hr = strtol(str + 1, &cp, 10); hr = strtol(str + 1, &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_TZDISP_OVERFLOW; return DTERR_TZDISP_OVERFLOW;
@ -2838,7 +2838,7 @@ DecodeTimezone(char *str, int *tzp)
/* explicit delimiter? */ /* explicit delimiter? */
if (*cp == ':') if (*cp == ':')
{ {
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
min = strtol(cp + 1, &cp, 10); min = strtol(cp + 1, &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_TZDISP_OVERFLOW; return DTERR_TZDISP_OVERFLOW;
@ -3085,7 +3085,7 @@ DecodeInterval(char **field, int *ftype, int nf, int *dtype, struct pg_tm * tm,
case DTK_DATE: case DTK_DATE:
case DTK_NUMBER: case DTK_NUMBER:
errno = 0; errno = 0; /* avoid checking LONG_MIN/LONG_MAX */
val = strtol(field[i], &cp, 10); val = strtol(field[i], &cp, 10);
if (errno == ERANGE) if (errno == ERANGE)
return DTERR_FIELD_OVERFLOW; return DTERR_FIELD_OVERFLOW;

26
src/backend/utils/adt/float.c
View File

@ -8,7 +8,7 @@
* *
* *
* IDENTIFICATION * 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)) while (*num != '\0' && isspace((unsigned char) *num))
num++; num++;
errno = 0; errno = 0; /* avoid checking HUGE_VAL */
val = strtod(num, &endptr); val = strtod(num, &endptr);
/* did we not see anything that looks like a double? */ /* 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)) while (*num != '\0' && isspace((unsigned char) *num))
num++; num++;
errno = 0; errno = 0; /* avoid checking HUGE_VAL */
val = strtod(num, &endptr); val = strtod(num, &endptr);
/* did we not see anything that looks like a double? */ /* 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 * We must check both for errno getting set and for a NaN result, in order
* to deal with the vagaries of different platforms... * to deal with the vagaries of different platforms...
*/ */
errno = 0; errno = 0; /* avoid checking result for failure */
result = pow(arg1, arg2); result = pow(arg1, arg2);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1506,7 +1506,7 @@ dexp(PG_FUNCTION_ARGS)
* to deal with the vagaries of different platforms. Also, a zero result * to deal with the vagaries of different platforms. Also, a zero result
* implies unreported underflow. * implies unreported underflow.
*/ */
errno = 0; errno = 0; /* avoid checking result for failure */
result = exp(arg1); result = exp(arg1);
if (errno != 0 || result == 0.0 if (errno != 0 || result == 0.0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1590,7 +1590,7 @@ dacos(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = acos(arg1); result = acos(arg1);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1615,7 +1615,7 @@ dasin(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = asin(arg1); result = asin(arg1);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1640,7 +1640,7 @@ datan(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = atan(arg1); result = atan(arg1);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1666,7 +1666,7 @@ datan2(PG_FUNCTION_ARGS)
float8 arg2 = PG_GETARG_FLOAT8(1); float8 arg2 = PG_GETARG_FLOAT8(1);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = atan2(arg1, arg2); result = atan2(arg1, arg2);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1691,7 +1691,7 @@ dcos(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = cos(arg1); result = cos(arg1);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1716,7 +1716,7 @@ dcot(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = tan(arg1); result = tan(arg1);
if (errno != 0 || result == 0.0 if (errno != 0 || result == 0.0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1742,7 +1742,7 @@ dsin(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = sin(arg1); result = sin(arg1);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE
@ -1767,7 +1767,7 @@ dtan(PG_FUNCTION_ARGS)
float8 arg1 = PG_GETARG_FLOAT8(0); float8 arg1 = PG_GETARG_FLOAT8(0);
float8 result; float8 result;
errno = 0; errno = 0; /* avoid checking result for failure */
result = tan(arg1); result = tan(arg1);
if (errno != 0 if (errno != 0
#ifdef HAVE_FINITE #ifdef HAVE_FINITE