diff options
Diffstat (limited to 'src/backend/access/nbtree/nbtcompare.c')
| -rw-r--r-- | src/backend/access/nbtree/nbtcompare.c | 201 |
1 files changed, 102 insertions, 99 deletions
diff --git a/src/backend/access/nbtree/nbtcompare.c b/src/backend/access/nbtree/nbtcompare.c index f005509be0..0312bbb69d 100644 --- a/src/backend/access/nbtree/nbtcompare.c +++ b/src/backend/access/nbtree/nbtcompare.c @@ -1,22 +1,22 @@ /*------------------------------------------------------------------------- * * nbtcompare.c-- - * Comparison functions for btree access method. + * Comparison functions for btree access method. * * Copyright (c) 1994, Regents of the University of California * * * IDENTIFICATION - * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtcompare.c,v 1.10 1997/06/11 05:20:05 vadim Exp $ + * $Header: /cvsroot/pgsql/src/backend/access/nbtree/nbtcompare.c,v 1.11 1997/09/07 04:38:39 momjian Exp $ * - * NOTES - * These functions are stored in pg_amproc. For each operator class - * defined on btrees, they compute + * NOTES + * These functions are stored in pg_amproc. For each operator class + * defined on btrees, they compute * - * compare(a, b): - * < 0 if a < b, - * = 0 if a == b, - * > 0 if a > b. + * compare(a, b): + * < 0 if a < b, + * = 0 if a == b, + * > 0 if a > b. *------------------------------------------------------------------------- */ @@ -30,168 +30,171 @@ int32 btint2cmp(int16 a, int16 b) { - return ((int32) (a - b)); + return ((int32) (a - b)); } int32 btint4cmp(int32 a, int32 b) { - return (a - b); + return (a - b); } int32 btint24cmp(int16 a, int32 b) { - return (((int32) a) - b); + return (((int32) a) - b); } int32 btint42cmp(int32 a, int16 b) { - return (a - ((int32) b)); + return (a - ((int32) b)); } int32 btfloat4cmp(float32 a, float32 b) { - if (*a > *b) - return (1); - else if (*a == *b) - return (0); - else - return (-1); + if (*a > *b) + return (1); + else if (*a == *b) + return (0); + else + return (-1); } int32 btfloat8cmp(float64 a, float64 b) { - if (*a > *b) - return (1); - else if (*a == *b) - return (0); - else - return (-1); + if (*a > *b) + return (1); + else if (*a == *b) + return (0); + else + return (-1); } int32 btoidcmp(Oid a, Oid b) { - if (a > b) - return (1); - else if (a == b) - return (0); - else - return (-1); + if (a > b) + return (1); + else if (a == b) + return (0); + else + return (-1); } int32 btabstimecmp(AbsoluteTime a, AbsoluteTime b) { - if (AbsoluteTimeIsBefore(a, b)) - return (-1); - else if (AbsoluteTimeIsBefore(b, a)) - return (1); - else - return (0); + if (AbsoluteTimeIsBefore(a, b)) + return (-1); + else if (AbsoluteTimeIsBefore(b, a)) + return (1); + else + return (0); } int32 btcharcmp(char a, char b) { - return ((int32) ((uint8)a - (uint8)b)); + return ((int32) ((uint8) a - (uint8) b)); } int32 btchar2cmp(uint16 a, uint16 b) { - return (strncmp((char *) &a, (char *) &b, 2)); + return (strncmp((char *) &a, (char *) &b, 2)); } int32 btchar4cmp(uint32 a, uint32 b) { - return (strncmp((char *) &a, (char *) &b, 4)); + return (strncmp((char *) &a, (char *) &b, 4)); } int32 btchar8cmp(char *a, char *b) { - return (strncmp(a, b, 8)); + return (strncmp(a, b, 8)); } int32 btchar16cmp(char *a, char *b) { - return (strncmp(a, b, 16)); + return (strncmp(a, b, 16)); } int32 -btnamecmp(NameData *a, NameData *b) +btnamecmp(NameData * a, NameData * b) { - return (strncmp(a->data, b->data, NAMEDATALEN)); + return (strncmp(a->data, b->data, NAMEDATALEN)); } int32 -bttextcmp(struct varlena *a, struct varlena *b) +bttextcmp(struct varlena * a, struct varlena * b) { - int res; - unsigned char *ap, *bp; + int res; + unsigned char *ap, + *bp; #ifdef USE_LOCALE - int la = VARSIZE(a) - VARHDRSZ; - int lb = VARSIZE(b) - VARHDRSZ; - - ap = (unsigned char *) palloc (la + 1); - bp = (unsigned char *) palloc (lb + 1); - - memcpy(ap, VARDATA(a), la); - *(ap + la) = '\0'; - memcpy(bp, VARDATA(b), lb); - *(bp + lb) = '\0'; - - res = strcoll (ap, bp); - - pfree (ap); - pfree (bp); + int la = VARSIZE(a) - VARHDRSZ; + int lb = VARSIZE(b) - VARHDRSZ; + + ap = (unsigned char *) palloc(la + 1); + bp = (unsigned char *) palloc(lb + 1); + + memcpy(ap, VARDATA(a), la); + *(ap + la) = '\0'; + memcpy(bp, VARDATA(b), lb); + *(bp + lb) = '\0'; + + res = strcoll(ap, bp); + + pfree(ap); + pfree(bp); #else - int len = VARSIZE(a); - - /* len is the length of the shorter of the two strings */ - if ( len > VARSIZE(b) ) - len = VARSIZE(b); - - len -= VARHDRSZ; - - ap = (unsigned char *) VARDATA(a); - bp = (unsigned char *) VARDATA(b); - - /* - * If the two strings differ in the first len bytes, or if they're - * the same in the first len bytes and they're both len bytes long, - * we're done. - */ - - res = 0; - if (len > 0) { - do { - res = (int) (*ap++ - *bp++); - len--; - } while (res == 0 && len != 0); - } + int len = VARSIZE(a); + + /* len is the length of the shorter of the two strings */ + if (len > VARSIZE(b)) + len = VARSIZE(b); + + len -= VARHDRSZ; + + ap = (unsigned char *) VARDATA(a); + bp = (unsigned char *) VARDATA(b); + + /* + * If the two strings differ in the first len bytes, or if they're the + * same in the first len bytes and they're both len bytes long, we're + * done. + */ + + res = 0; + if (len > 0) + { + do + { + res = (int) (*ap++ - *bp++); + len--; + } while (res == 0 && len != 0); + } #endif - - if (res != 0 || VARSIZE(a) == VARSIZE(b)) - return (res); - - /* - * The two strings are the same in the first len bytes, and they - * are of different lengths. - */ - - if (VARSIZE(a) < VARSIZE(b)) - return (-1); - else - return (1); + + if (res != 0 || VARSIZE(a) == VARSIZE(b)) + return (res); + + /* + * The two strings are the same in the first len bytes, and they are + * of different lengths. + */ + + if (VARSIZE(a) < VARSIZE(b)) + return (-1); + else + return (1); } |