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om: "Martin J. Laubach" <mjl@CSlab.tuwien.ac.at>

Browse Source 
Subject: [HACKERS] Patch for io routines

  I am currently trying to improve on the front-backend communication
routines; and noticed that lots of code are duplicated for libpq and
the backend. This is a first patch that tries to share code between
the two, more to follow.

        mjl
This commit is contained in:
Marc G. Fournier
1997-03-16 18:51:29 +00:00
parent a9049a4a28
commit ea58f28ee8
3 changed files with 86 additions and 87 deletions
Download Patch File Download Diff File Expand all files Collapse all files

157
src/interfaces/libpq/fe-misc.c
View File

@@ -11,7 +11,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.4 1996/12/31 07:29:17 bryanh Exp $
* $Header: /cvsroot/pgsql/src/interfaces/libpq/fe-misc.c,v 1.5 1997/03/16 18:51:29 scrappy Exp $
*
*-------------------------------------------------------------------------
*/
@@ -23,76 +23,73 @@
#include "libpq-fe.h"
/* --------------------------------------------------------------------- */
/* pqGetc:
get a character from stream f
if debug is set, also echo the character fetched
*/
int
pqGetc(FILE* fin, FILE* debug)
int pqGetc(FILE* fin, FILE* debug)
{
int c;
c = getc(fin);
if (debug && c != EOF)
fprintf(debug, "From backend> %c\n", c);
return c;
}
/* --------------------------------------------------------------------- */
/* pqPutnchar:
send a string of exactly len length into stream f
returns 1 if there was an error, 0 otherwise.
*/
int
pqPutnchar(const char* s, int len, FILE *f, FILE *debug)
int pqPutnchar(const char* s, int len, FILE *f, FILE *debug)
{
int status;
if (f == NULL)
return 1;
if (debug) fputs("To backend>", debug);
while (len--) {
status = fputc(*s,f);
if (debug)
fputc(*s,debug);
s++;
if (status == EOF)
if(debug)
fprintf(debug, "To backend> %s\n", s);
if(fwrite(s, 1, len, f) != len)
return 1;
}
if (debug) fputc('\n', debug);
return 0;
}
/* --------------------------------------------------------------------- */
/* pqGetnchar:
get a string of exactly len length from stream f
*/
int
pqGetnchar(char* s, int len, FILE *f, FILE *debug)
int pqGetnchar(char* s, int len, FILE *f, FILE *debug)
{
int c;
int cnt;
if (f == NULL)
return 1;
while (len-- && (c = getc(f)) != EOF)
*s++ = c;
*s = '\0';
cnt = fread(s, 1, len, f);
s[cnt] = '\0';
/* mjl: actually needs up to len+1 bytes, is this okay? XXX */
if (debug)
fprintf(debug, "From backend (%d)> %s\n", len, s);
if (debug) {
fprintf(debug, "From backend> %s\n", s);
}
return 0;
}
/* --------------------------------------------------------------------- */
/* pqGets:
get a string of up to length len from stream f
*/
int
pqGets(char* s, int len, FILE *f, FILE *debug)
int pqGets(char* s, int len, FILE *f, FILE *debug)
{
int c;
const char *str = s;
if (f == NULL)
return 1;
@@ -100,104 +97,98 @@ pqGets(char* s, int len, FILE *f, FILE *debug)
while (len-- && (c = getc(f)) != EOF && c)
*s++ = c;
*s = '\0';
/* mjl: actually needs up to len+1 bytes, is this okay? XXX */
if (debug)
fprintf(debug, "From backend> \"%s\"\n", str);
if (debug) {
fprintf(debug, "From backend> %s\n", s);
}
return 0;
}
/* --------------------------------------------------------------------- */
/* pgPutInt
send an integer of up to 4 bytesto the file stream
do this one byte at at time.
This insures that machines with different ENDIANness can talk to each other
get a n-byte integer from the stream into result
send an integer of 2 or 4 bytes to the file stream, compensate
for host endianness.
returns 0 if successful, 1 otherwise
*/
int
pqPutInt(const int integer, int bytes, FILE* f, FILE *debug)
int pqPutInt(const int integer, int bytes, FILE* f, FILE *debug)
{
int i;
int status;
int retval = 0;
i = integer;
switch(bytes)
{
case 2:
retval = pqPutShort(integer, f);
break;
case 4:
retval = pqPutLong(integer, f);
break;
default:
fprintf(stderr, "** int size %d not supported\n", bytes);
retval = 1;
}
if (bytes > 4)
bytes = 4;
if (debug) fprintf(debug, "To backend (%d#)> %d\n", bytes, integer);
while (bytes--) {
status = fputc(i & 0xff, f);
i >>= 8;
if (status == EOF) {
return 1;
}
}
if (debug) fprintf(debug, "To backend (#)> %d\n", integer);
return 0;
return retval;
}
/* --------------------------------------------------------------------- */
/* pgGetInt
reconstructs the integer one byte at a time.
This insures that machines with different ENDIANness can talk to each other
get a n-byte integer from the stream into result
read a 2 or 4 byte integer from the stream and swab it around
to compensate for different endianness
returns 0 if successful
*/
int
pqGetInt(int* result, int bytes, FILE* f, FILE *debug)
int pqGetInt(int* result, int bytes, FILE* f, FILE *debug)
{
int c;
int p;
int n;
if (f == NULL)
return 1;
int retval = 0;
p = 0;
n = 0;
while (bytes && (c = getc(f)) != EOF)
switch(bytes)
{
n |= (c & 0xff) << p;
p += 8;
bytes--;
case 2:
retval = pqGetShort(result, f);
break;
case 4:
retval = pqGetLong(result, f);
break;
default:
fprintf(stderr, "** int size %d not supported\n", bytes);
retval = 1;
}
if (bytes != 0)
return 1;
*result = n;
if (debug)
fprintf(debug,"From backend (#)> %d\n",*result);
return 0;
fprintf(debug,"From backend (#%d)> %d\n", bytes, *result);
return retval;
}
int
pqPuts(const char* s, FILE *f, FILE *debug)
/* --------------------------------------------------------------------- */
int pqPuts(const char* s, FILE *f, FILE *debug)
{
if (f == NULL)
return 1;
if (fputs(s,f) == EOF)
if (fputs(s, f) == EOF)
return 1;
fputc('\0',f); /* important to send an ending EOF since backend expects it */
fputc('\0', f); /* important to send an ending \0 since backend expects it */
fflush(f);
if (debug) {
fprintf(debug, "To backend> %s\n", s);
}
return 0;
}
void
pqFlush(FILE *f, FILE *debug)
/* --------------------------------------------------------------------- */
void pqFlush(FILE *f, FILE *debug)
{
if (f)
fflush(f);
if (debug)
fflush(debug);
}
/* --------------------------------------------------------------------- */