greenplumn string 源码
greenplumn string 代码
文件路径：/src/common/string.c
/*-------------------------------------------------------------------------
*
* string.c
* string handling helpers
*
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/common/string.c
*
*-------------------------------------------------------------------------
*/
#ifndef FRONTEND
#include "postgres.h"
#else
#include "postgres_fe.h"
#endif
#include "common/string.h"
/*
* Returns whether the string `str' has the postfix `end'.
*/
bool
pg_str_endswith(const char *str, const char *end)
{
size_t slen = strlen(str);
size_t elen = strlen(end);
/* can't be a postfix if longer */
if (elen > slen)
return false;
/* compare the end of the strings */
str += slen - elen;
return strcmp(str, end) == 0;
}
/*
* strtoint --- just like strtol, but returns int not long
*/
int
strtoint(const char *pg_restrict str, char **pg_restrict endptr, int base)
{
long val;
val = strtol(str, endptr, base);
if (val != (int) val)
errno = ERANGE;
return (int) val;
}
/*
* pg_clean_ascii -- Replace any non-ASCII chars with a '?' char
*
* Modifies the string passed in which must be '\0'-terminated.
*
* This function exists specifically to deal with filtering out
* non-ASCII characters in a few places where the client can provide an almost
* arbitrary string (and it isn't checked to ensure it's a valid username or
* database name or similar) and we don't want to have control characters or other
* things ending up in the log file where server admins might end up with a
* messed up terminal when looking at them.
*
* In general, this function should NOT be used- instead, consider how to handle
* the string without needing to filter out the non-ASCII characters.
*
* Ultimately, we'd like to improve the situation to not require stripping out
* all non-ASCII but perform more intelligent filtering which would allow UTF or
* similar, but it's unclear exactly what we should allow, so stick to ASCII only
* for now.
*/
void
pg_clean_ascii(char *str)
{
/* Only allow clean ASCII chars in the string */
char *p;
for (p = str; *p != '\0'; p++)
{
if (*p < 32 || *p > 126)
*p = '?';
}
}
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