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/*
* Some utility functions for Postgres.
*
* - Literal & ident quoting.
* - Array parsing
*/
#include <usual/pgutil.h>
#include <usual/ctype.h>
/* str -> E'str' */
bool pg_quote_literal(char *_dst, const char *_src, int dstlen)
{
char *dst = _dst;
char *end = _dst + dstlen - 2;
const char *src = _src;
bool stdquote = true;
if (dstlen < 3)
return false;
if (_src == NULL) {
if (dstlen < 5)
return false;
memcpy(_dst, "NULL", 5);
return true;
}
retry:
*dst++ = '\'';
while (*src && dst < end) {
if (*src == '\'')
*dst++ = '\'';
else if (*src == '\\') {
if (stdquote)
goto retry_ext;
*dst++ = '\\';
}
*dst++ = *src++;
}
if (*src || dst > end)
return false;
*dst++ = '\'';
*dst = 0;
return true;
retry_ext:
/* string contains '\\', retry as E'' string */
dst = _dst;
src = _src;
*dst++ = 'E';
stdquote = false;
goto retry;
}
static inline bool id_start(unsigned char c)
{
return (c >= 'a' && c <= 'z') || c == '_';
}
static inline bool id_body(unsigned char c)
{
return id_start(c) || (c >= '0' && c <= '9');
}
/* ident -> "ident" */
bool pg_quote_ident(char *_dst, const char *_src, int dstlen)
{
char *dst = _dst;
char *end = _dst + dstlen - 1;
const char *src = _src;
if (dstlen < 1)
return false;
if (!id_start(*src))
goto needs_quoting;
while (*src && dst < end) {
if (!id_body(*src))
goto needs_quoting;
*dst++ = *src++;
}
if (*src)
return false;
*dst = 0;
if (!pg_is_reserved_word(_dst))
return true;
needs_quoting:
dst = _dst;
src = _src;
end = _dst + dstlen - 2;
if (dstlen < 3)
return false;
*dst++ = '"';
while (*src && dst < end) {
if (*src == '"')
*dst++ = *src;
*dst++ = *src++;
}
if (*src)
return false;
*dst++ = '"';
*dst = 0;
return true;
}
/* schema.name -> "schema"."name" */
bool pg_quote_fqident(char *_dst, const char *_src, int dstlen)
{
const char *dot = strchr(_src, '.');
char scmbuf[128];
const char *scm;
int scmlen;
if (dot) {
scmlen = dot - _src;
if (scmlen >= (int)sizeof(scmbuf))
return false;
memcpy(scmbuf, _src, scmlen);
scmbuf[scmlen] = 0;
scm = scmbuf;
_src = dot + 1;
} else {
scm = "public";
}
if (!pg_quote_ident(_dst, scm, dstlen))
return false;
scmlen = strlen(_dst);
_dst[scmlen] = '.';
_dst += scmlen + 1;
dstlen -= scmlen + 1;
if (!pg_quote_ident(_dst, _src, dstlen))
return false;
return true;
}
/*
* pgarray parsing
*/
static bool parse_value(struct StrList *arr, const char *val, const char *vend,
CxMem *cx)
{
int len;
const char *s;
char *str, *p;
unsigned c;
while (val < vend && isspace(*val))
val++;
while (vend > val && isspace(vend[-1]))
vend--;
if (val == vend) return false;
s = val;
len = vend - val;
if (len == 4 && !strncasecmp(val, "null", len)) {
return strlist_append_ref(arr, NULL);
}
p = str = cx_alloc(cx, len + 1);
if (!str)
return false;
/* unquote & copy */
while (s < vend) {
c = *s++;
if (c == '"') {
while (1) {
c = *s++;
if (c == '"')
break;
else if (c == '\\')
*p++ = *s++;
else
*p++ = c;
}
} else if (c == '\\') {
*p++ = *s++;
} else
*p++ = c;
}
*p++ = 0;
if (!strlist_append_ref(arr, str)) {
cx_free(cx, str);
return false;
}
return true;
}
struct StrList *pg_parse_array(const char *pgarr, CxMem *cx)
{
const char *s = pgarr;
struct StrList *lst;
const char *val = NULL;
unsigned c;
/* skip dimension def "[x,y]={..}" */
if (*s == '[') {
s = strchr(s, ']');
if (!s || s[1] != '=')
return NULL;
s += 2;
}
if (*s++ != '{')
return NULL;
lst = strlist_new(cx);
if (!lst)
return NULL;
while (*s) {
/* array end */
if (s[0] == '}') {
if (s[1] != 0) {
goto failed;
}
if (val) {
if (!parse_value(lst, val, s, cx))
goto failed;
}
return lst;
}
/* cannot init earlier to support empty arrays */
if (!val)
val = s;
/* val done? */
if (*s == ',') {
if (!parse_value(lst, val, s, cx))
goto failed;
val = ++s;
continue;
}
/* scan value */
c = *s++;
if (c == '"') {
while (1) {
c = *s++;
if (c == '"')
break;
else if (c == '\\') {
if (!*s) goto failed;
s++;
} else if (!*s)
goto failed;
}
} else if (c == '\\') {
if (!*s) goto failed;
s++;
}
}
if (s[-1] != '}')
goto failed;
return lst;
failed:
strlist_free(lst);
return NULL;
}
/*
* Postgres keyword lookup.
*/
/* gperf tries ot inline a non-static function. */
#undef inline
#undef __inline
#undef __attribute__
#define inline
#define __inline
#define __attribute__(x)
#define long uintptr_t
/* include gperf code */
const char *pg_keyword_lookup_real(const char *str, unsigned int len);
#include <usual/pgutil_kwlookup.h>
bool pg_is_reserved_word(const char *str)
{
const char *kw = pg_keyword_lookup_real(str, strlen(str));
return kw != NULL;
}
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