PostgreSQL Source Code git master
Macros | Functions
char.c File Reference
#include "postgres.h"
#include <limits.h>
#include "libpq/pqformat.h"
#include "utils/fmgrprotos.h"
#include "varatt.h"
Include dependency graph for char.c:

Go to the source code of this file.

Macros

#define  ISOCTAL(c)   (((c) >= '0') && ((c) <= '7'))
 
#define  TOOCTAL(c)   ((c) + '0')
 
#define  FROMOCTAL(c)   ((unsigned char) (c) - '0')
 

Functions

Datum  charin (PG_FUNCTION_ARGS)
 
Datum  charout (PG_FUNCTION_ARGS)
 
Datum  charrecv (PG_FUNCTION_ARGS)
 
Datum  charsend (PG_FUNCTION_ARGS)
 
Datum  chareq (PG_FUNCTION_ARGS)
 
Datum  charne (PG_FUNCTION_ARGS)
 
Datum  charlt (PG_FUNCTION_ARGS)
 
Datum  charle (PG_FUNCTION_ARGS)
 
Datum  chargt (PG_FUNCTION_ARGS)
 
Datum  charge (PG_FUNCTION_ARGS)
 
Datum  chartoi4 (PG_FUNCTION_ARGS)
 
Datum  i4tochar (PG_FUNCTION_ARGS)
 
Datum  text_char (PG_FUNCTION_ARGS)
 
Datum  char_text (PG_FUNCTION_ARGS)
 

Macro Definition Documentation

◆ FROMOCTAL

#define FROMOCTAL (   c )    ((unsigned char) (c) - '0')

Definition at line 26 of file char.c.

◆ ISOCTAL

#define ISOCTAL (   c )    (((c) >= '0') && ((c) <= '7'))

Definition at line 24 of file char.c.

◆ TOOCTAL

#define TOOCTAL (   c )    ((c) + '0')

Definition at line 25 of file char.c.

Function Documentation

◆ char_text()

Datum char_text ( PG_FUNCTION_ARGS  )

Definition at line 228 of file char.c.

229{
230 char arg1 = PG_GETARG_CHAR(0);
231 text *result = palloc(VARHDRSZ + 4);
232
233 /*
234 * Conversion rules are the same as in charout(), but here we need to be
235 * honest about converting 0x00 to an empty string.
236 */
237 if (IS_HIGHBIT_SET(arg1))
238 {
239 SET_VARSIZE(result, VARHDRSZ + 4);
240 (VARDATA(result))[0] = '\\';
241 (VARDATA(result))[1] = TOOCTAL(((unsigned char) arg1) >> 6);
242 (VARDATA(result))[2] = TOOCTAL((((unsigned char) arg1) >> 3) & 07);
243 (VARDATA(result))[3] = TOOCTAL(((unsigned char) arg1) & 07);
244 }
245 else if (arg1 != '0円')
246 {
247 SET_VARSIZE(result, VARHDRSZ + 1);
248 *(VARDATA(result)) = arg1;
249 }
250 else
251 SET_VARSIZE(result, VARHDRSZ);
252
253 PG_RETURN_TEXT_P(result);
254}
#define IS_HIGHBIT_SET(ch)
Definition: c.h:1154
#define VARHDRSZ
Definition: c.h:697
#define TOOCTAL(c)
Definition: char.c:25
#define PG_GETARG_CHAR(n)
Definition: fmgr.h:273
#define PG_RETURN_TEXT_P(x)
Definition: fmgr.h:372
void * palloc(Size size)
Definition: mcxt.c:1365
Definition: c.h:692
static char * VARDATA(const void *PTR)
Definition: varatt.h:305
static void SET_VARSIZE(void *PTR, Size len)
Definition: varatt.h:432

References IS_HIGHBIT_SET, palloc(), PG_GETARG_CHAR, PG_RETURN_TEXT_P, SET_VARSIZE(), TOOCTAL, VARDATA(), and VARHDRSZ.

◆ chareq()

Datum chareq ( PG_FUNCTION_ARGS  )

Definition at line 127 of file char.c.

128{
129 char arg1 = PG_GETARG_CHAR(0);
130 char arg2 = PG_GETARG_CHAR(1);
131
132 PG_RETURN_BOOL(arg1 == arg2);
133}
#define PG_RETURN_BOOL(x)
Definition: fmgr.h:359

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

◆ charge()

Datum charge ( PG_FUNCTION_ARGS  )

Definition at line 172 of file char.c.

173{
174 char arg1 = PG_GETARG_CHAR(0);
175 char arg2 = PG_GETARG_CHAR(1);
176
177 PG_RETURN_BOOL((uint8) arg1 >= (uint8) arg2);
178}
uint8_t uint8
Definition: c.h:536

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

◆ chargt()

Datum chargt ( PG_FUNCTION_ARGS  )

Definition at line 163 of file char.c.

164{
165 char arg1 = PG_GETARG_CHAR(0);
166 char arg2 = PG_GETARG_CHAR(1);
167
168 PG_RETURN_BOOL((uint8) arg1 > (uint8) arg2);
169}

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

◆ charin()

Datum charin ( PG_FUNCTION_ARGS  )

Definition at line 41 of file char.c.

42{
43 char *ch = PG_GETARG_CSTRING(0);
44
45 if (strlen(ch) == 4 && ch[0] == '\\' &&
46 ISOCTAL(ch[1]) && ISOCTAL(ch[2]) && ISOCTAL(ch[3]))
47 PG_RETURN_CHAR((FROMOCTAL(ch[1]) << 6) +
48 (FROMOCTAL(ch[2]) << 3) +
49 FROMOCTAL(ch[3]));
50 /* This will do the right thing for a zero-length input string */
51 PG_RETURN_CHAR(ch[0]);
52}
#define ISOCTAL(c)
Definition: char.c:24
#define FROMOCTAL(c)
Definition: char.c:26
#define PG_GETARG_CSTRING(n)
Definition: fmgr.h:277
#define PG_RETURN_CHAR(x)
Definition: fmgr.h:358

References FROMOCTAL, ISOCTAL, PG_GETARG_CSTRING, and PG_RETURN_CHAR.

◆ charle()

Datum charle ( PG_FUNCTION_ARGS  )

Definition at line 154 of file char.c.

155{
156 char arg1 = PG_GETARG_CHAR(0);
157 char arg2 = PG_GETARG_CHAR(1);
158
159 PG_RETURN_BOOL((uint8) arg1 <= (uint8) arg2);
160}

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

◆ charlt()

Datum charlt ( PG_FUNCTION_ARGS  )

Definition at line 145 of file char.c.

146{
147 char arg1 = PG_GETARG_CHAR(0);
148 char arg2 = PG_GETARG_CHAR(1);
149
150 PG_RETURN_BOOL((uint8) arg1 < (uint8) arg2);
151}

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

◆ charne()

Datum charne ( PG_FUNCTION_ARGS  )

Definition at line 136 of file char.c.

137{
138 char arg1 = PG_GETARG_CHAR(0);
139 char arg2 = PG_GETARG_CHAR(1);
140
141 PG_RETURN_BOOL(arg1 != arg2);
142}

References PG_GETARG_CHAR, and PG_RETURN_BOOL.

◆ charout()

Datum charout ( PG_FUNCTION_ARGS  )

Definition at line 64 of file char.c.

65{
66 char ch = PG_GETARG_CHAR(0);
67 char *result = (char *) palloc(5);
68
69 if (IS_HIGHBIT_SET(ch))
70 {
71 result[0] = '\\';
72 result[1] = TOOCTAL(((unsigned char) ch) >> 6);
73 result[2] = TOOCTAL((((unsigned char) ch) >> 3) & 07);
74 result[3] = TOOCTAL(((unsigned char) ch) & 07);
75 result[4] = '0円';
76 }
77 else
78 {
79 /* This produces acceptable results for 0x00 as well */
80 result[0] = ch;
81 result[1] = '0円';
82 }
83 PG_RETURN_CSTRING(result);
84}
#define PG_RETURN_CSTRING(x)
Definition: fmgr.h:362

References IS_HIGHBIT_SET, palloc(), PG_GETARG_CHAR, PG_RETURN_CSTRING, and TOOCTAL.

◆ charrecv()

Datum charrecv ( PG_FUNCTION_ARGS  )

Definition at line 94 of file char.c.

95{
97
99}
#define PG_GETARG_POINTER(n)
Definition: fmgr.h:276
static char * buf
Definition: pg_test_fsync.c:72
int pq_getmsgbyte(StringInfo msg)
Definition: pqformat.c:399
struct StringInfoData * StringInfo
Definition: string.h:15

References buf, PG_GETARG_POINTER, PG_RETURN_CHAR, and pq_getmsgbyte().

◆ charsend()

Datum charsend ( PG_FUNCTION_ARGS  )

Definition at line 105 of file char.c.

106{
107 char arg1 = PG_GETARG_CHAR(0);
109
111 pq_sendbyte(&buf, arg1);
113}
#define PG_RETURN_BYTEA_P(x)
Definition: fmgr.h:371
void pq_begintypsend(StringInfo buf)
Definition: pqformat.c:326
bytea * pq_endtypsend(StringInfo buf)
Definition: pqformat.c:346
static void pq_sendbyte(StringInfo buf, uint8 byt)
Definition: pqformat.h:160

References buf, PG_GETARG_CHAR, PG_RETURN_BYTEA_P, pq_begintypsend(), pq_endtypsend(), and pq_sendbyte().

◆ chartoi4()

Datum chartoi4 ( PG_FUNCTION_ARGS  )

Definition at line 182 of file char.c.

183{
184 char arg1 = PG_GETARG_CHAR(0);
185
186 PG_RETURN_INT32((int32) ((int8) arg1));
187}
int8_t int8
Definition: c.h:532
int32_t int32
Definition: c.h:534
#define PG_RETURN_INT32(x)
Definition: fmgr.h:354

References PG_GETARG_CHAR, and PG_RETURN_INT32.

◆ i4tochar()

Datum i4tochar ( PG_FUNCTION_ARGS  )

Definition at line 190 of file char.c.

191{
192 int32 arg1 = PG_GETARG_INT32(0);
193
194 if (arg1 < SCHAR_MIN || arg1 > SCHAR_MAX)
196 (errcode(ERRCODE_NUMERIC_VALUE_OUT_OF_RANGE),
197 errmsg("\"char\" out of range")));
198
199 PG_RETURN_CHAR((int8) arg1);
200}
int errcode(int sqlerrcode)
Definition: elog.c:854
int errmsg(const char *fmt,...)
Definition: elog.c:1071
#define ERROR
Definition: elog.h:39
#define ereport(elevel,...)
Definition: elog.h:150
#define PG_GETARG_INT32(n)
Definition: fmgr.h:269

References ereport, errcode(), errmsg(), ERROR, PG_GETARG_INT32, and PG_RETURN_CHAR.

◆ text_char()

Datum text_char ( PG_FUNCTION_ARGS  )

Definition at line 204 of file char.c.

205{
206 text *arg1 = PG_GETARG_TEXT_PP(0);
207 char *ch = VARDATA_ANY(arg1);
208 char result;
209
210 /*
211 * Conversion rules are the same as in charin(), but here we need to
212 * handle the empty-string case honestly.
213 */
214 if (VARSIZE_ANY_EXHDR(arg1) == 4 && ch[0] == '\\' &&
215 ISOCTAL(ch[1]) && ISOCTAL(ch[2]) && ISOCTAL(ch[3]))
216 result = (FROMOCTAL(ch[1]) << 6) +
217 (FROMOCTAL(ch[2]) << 3) +
218 FROMOCTAL(ch[3]);
219 else if (VARSIZE_ANY_EXHDR(arg1) > 0)
220 result = ch[0];
221 else
222 result = '0円';
223
224 PG_RETURN_CHAR(result);
225}
#define PG_GETARG_TEXT_PP(n)
Definition: fmgr.h:309
static Size VARSIZE_ANY_EXHDR(const void *PTR)
Definition: varatt.h:472
static char * VARDATA_ANY(const void *PTR)
Definition: varatt.h:486

References FROMOCTAL, ISOCTAL, PG_GETARG_TEXT_PP, PG_RETURN_CHAR, VARDATA_ANY(), and VARSIZE_ANY_EXHDR().

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