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Commitc7ae53a

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Clarify need for \r\n -> \n translation in version checking code.
1 parent1a3de15 commitc7ae53a

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1 file changed

+13
-11
lines changed

1 file changed

+13
-11
lines changed

‎src/port/exec.c

Lines changed: 13 additions & 11 deletions
Original file line numberDiff line numberDiff line change
@@ -7,7 +7,7 @@
77
*
88
*
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* IDENTIFICATION
10-
* $PostgreSQL: pgsql/src/port/exec.c,v 1.21 2004/08/09 20:20:46 tgl Exp $
10+
* $PostgreSQL: pgsql/src/port/exec.c,v 1.22 2004/08/16 01:26:31 momjian Exp $
1111
*
1212
*-------------------------------------------------------------------------
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*/
@@ -381,26 +381,28 @@ static char *pipe_read_line(char *cmd, char *line, int maxsize)
381381
{
382382
/* So we read some data */
383383
retval=line;
384+
intlen=strlen(line);
384385

385386
/*
386-
*Sometime the child returns "\r\n", which doesn't match
387-
*our version string. The backend uses
388-
*setvbuf(stdout, NULL, _IONBF, 0), but pg_dump doesn't
389-
*so we have to fix it here.
387+
*If EOL is \r\n, convert to just \n.
388+
*Because stdout is a text-mode stream, the \n output by
389+
*the child process is received as \r\n, so we convert it
390+
*to \n. The server main.c sets
391+
*setvbuf(stdout, NULL, _IONBF, 0) which has the effect
392+
*of disabling \n to \r\n expansion for stdout.
390393
*/
391-
if (strlen(line) >=2&&
392-
line[strlen(line)-2]=='\r'&&
393-
line[strlen(line)-1]=='\n')
394+
if (len >=2&&line[len-2]=='\r'&&line[len-1]=='\n')
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{
395-
line[strlen(line)-2]='\n';
396-
line[strlen(line)-1]='\0';
396+
line[len-2]='\n';
397+
line[len-1]='\0';
398+
len--;
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}
398400

399401
/*
400402
*We emulate fgets() behaviour. So if there is no newline
401403
*at the end, we add one...
402404
*/
403-
if (line[strlen(line)-1]!='\n')
405+
if (line[len-1]!='\n')
404406
strcat(line,"\n");
405407
}
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