Add routines to convert between varchar and bpchar.
Add routines to allow sizing of varchar and bpchar into target columns.
This commit is contained in:
Thomas G. Lockhart
parent
9afe03355a
commit
cb03826201
@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.30 1998/04/27 17:08:26 scrappy Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varchar.c,v 1.31 1998/05/09 22:42:07 thomas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -130,12 +130,103 @@ bpcharout(char *s)
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return (result);
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}
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/* bpchar()
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* Converts a char() type to a specific internal length.
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* len is the length specified in () plus VARHDRSZ bytes.
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*/
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char *
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bpchar(char *s, int32 len)
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{
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char *result,
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*r;
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int rlen, slen;
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int i;
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if (s == NULL)
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return ((char *) NULL);
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if ((len == -1) || (len == VARSIZE(s)))
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return (s);
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rlen = len - VARHDRSZ;
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if (rlen > 4096)
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elog(ERROR, "bpchar: length of char() must be less than 4096");
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#ifdef STRINGDEBUG
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printf("bpchar- convert string length %d (%d) ->%d (%d)\n",
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VARSIZE(s)-VARHDRSZ, VARSIZE(s), rlen, len);
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#endif
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result = (char *) palloc(len);
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VARSIZE(result) = len;
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r = VARDATA(result);
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slen = VARSIZE(s) - VARHDRSZ;
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s = VARDATA(s);
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#ifdef STRINGDEBUG
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printf("bpchar- string is '");
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#endif
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for (i = 0; (i < rlen) && (i < slen); i++)
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{
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if (*s == '\0')
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break;
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#ifdef STRINGDEBUG
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printf("%c", *s);
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#endif
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*r++ = *s++;
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}
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#ifdef STRINGDEBUG
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printf("'\n");
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#endif
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/* blank pad the string if necessary */
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for (; i < rlen; i++)
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{
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*r++ = ' ';
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}
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return (result);
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} /* bpchar() */
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/* bpchar_char()
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* Convert bpchar(1) to char.
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*/
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int32
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bpchar_char(char *s)
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{
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return ((int32) *VARDATA(s));
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} /* char_bpchar() */
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/* char_bpchar()
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* Convert char to bpchar(1).
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*/
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char *
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char_bpchar(int32 c)
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{
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char *result;
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result = palloc(VARHDRSZ+1);
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VARSIZE(result) = VARHDRSZ+1;
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*(VARDATA(result)) = (char) c;
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return result;
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} /* char_bpchar() */
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/*****************************************************************************
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* varchar - varchar() *
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*****************************************************************************/
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/*
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* vcharin -
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* varcharin -
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* converts a string of varchar() type to the internal representation.
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* len is the length specified in () plus VARHDRSZ bytes. (XXX dummy is here
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* because we pass typelem as the second argument for array_in.)
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@ -193,6 +284,38 @@ varcharout(char *s)
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return (result);
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}
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/* varchar()
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* Converts a varchar() type to the specified size.
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* slen is the length specified in () plus VARHDRSZ bytes.
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*/
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char *
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varchar(char *s, int32 slen)
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{
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char *result;
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int len;
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if (s == NULL)
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return ((char *) NULL);
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len = VARSIZE(s);
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if ((slen == -1) || (len <= slen))
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return ((char *) s);
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/* only reach here if we need to truncate string... */
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len = slen - VARHDRSZ;
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if (len > 4096)
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elog(ERROR, "varchar: length of varchar() must be less than 4096");
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result = (char *) palloc(slen);
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VARSIZE(result) = slen;
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strncpy(VARDATA(result), VARDATA(s), len);
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return (result);
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} /* varchar() */
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/*****************************************************************************
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* Comparison Functions used for bpchar
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*****************************************************************************/
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@ -7,7 +7,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.33 1998/04/27 17:08:28 scrappy Exp $
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* $Header: /cvsroot/pgsql/src/backend/utils/adt/varlena.c,v 1.34 1998/05/09 22:42:07 thomas Exp $
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*
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*-------------------------------------------------------------------------
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*/
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@ -255,8 +255,6 @@ textoctetlen(text *t)
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* Updated by Thomas, Thomas.Lockhart@jpl.nasa.gov 1997-07-10.
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* Allocate space for output in all cases.
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* XXX - thomas 1997-07-10
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* As in previous code, allow concatenation when one string is NULL.
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* Is this OK?
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*/
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text *
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textcat(text *t1, text *t2)
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@ -267,33 +265,34 @@ textcat(text *t1, text *t2)
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char *ptr;
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text *result;
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if (!PointerIsValid(t1) && !PointerIsValid(t2))
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if (!PointerIsValid(t1) || !PointerIsValid(t2))
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return (NULL);
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len1 = (PointerIsValid(t1) ? (VARSIZE(t1) - VARHDRSZ) : 0);
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len1 = (VARSIZE(t1) - VARHDRSZ);
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if (len1 < 0)
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len1 = 0;
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while (len1 > 0 && VARDATA(t1)[len1 - 1] == '\0')
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len1--;
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len2 = (PointerIsValid(t2) ? (VARSIZE(t2) - VARHDRSZ) : 0);
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len2 = (VARSIZE(t2) - VARHDRSZ);
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if (len2 < 0)
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len2 = 0;
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while (len2 > 0 && VARDATA(t2)[len2 - 1] == '\0')
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len2--;
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result = palloc(len = len1 + len2 + VARHDRSZ);
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/* Fill data field of result string... */
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ptr = VARDATA(result);
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if (PointerIsValid(t1))
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memcpy(ptr, VARDATA(t1), len1);
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if (PointerIsValid(t2))
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memcpy(ptr + len1, VARDATA(t2), len2);
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len = len1 + len2 + VARHDRSZ;
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result = palloc(len);
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/* Set size of result string... */
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VARSIZE(result) = len;
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/* Fill data field of result string... */
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ptr = VARDATA(result);
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if (len1 > 0)
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memcpy(ptr, VARDATA(t1), len1);
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if (len2 > 0)
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memcpy(ptr + len1, VARDATA(t2), len2);
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return (result);
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} /* textcat() */
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@ -6,7 +6,7 @@
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*
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* Copyright (c) 1994, Regents of the University of California
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*
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* $Id: builtins.h,v 1.41 1998/04/27 17:09:28 scrappy Exp $
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* $Id: builtins.h,v 1.42 1998/05/09 22:45:14 thomas Exp $
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*
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* NOTES
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* This should normally only be included by fmgr.h.
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@ -392,6 +392,9 @@ time_t datetime_timestamp(DateTime *datetime);
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/* varchar.c */
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extern char *bpcharin(char *s, int dummy, int16 atttypmod);
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extern char *bpcharout(char *s);
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extern char *bpchar(char *s, int32 slen);
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extern char *char_bpchar(int32 c);
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extern int32 bpchar_char(char *s);
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extern bool bpchareq(char *arg1, char *arg2);
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extern bool bpcharne(char *arg1, char *arg2);
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extern bool bpcharlt(char *arg1, char *arg2);
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@ -405,6 +408,7 @@ extern uint32 hashbpchar(struct varlena * key);
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extern char *varcharin(char *s, int dummy, int16 atttypmod);
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extern char *varcharout(char *s);
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extern char *varchar(char *s, int32 slen);
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extern bool varchareq(char *arg1, char *arg2);
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extern bool varcharne(char *arg1, char *arg2);
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extern bool varcharlt(char *arg1, char *arg2);
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