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Formatting cleanup in ecpglib/prepare.c.

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Looking at this code made my head hurt.  Format the comments more
like the way it's done elsewhere, break a few overly long lines.
No actual code changes in this commit.
This commit is contained in:
Tom Lane 2018-10-16 23:43:15 -04:00
parent 28d750c0cd
commit 92dff34116
1 changed files with 56 additions and 43 deletions
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99
src/interfaces/ecpg/ecpglib/prepare.c
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@ -18,13 +18,13 @@ typedef struct
int lineno; int lineno;
char stmtID[STMTID_SIZE]; char stmtID[STMTID_SIZE];
char *ecpgQuery; char *ecpgQuery;
long execs; /* # of executions */ long execs; /* # of executions */
const char *connection; /* connection for the statement */ const char *connection; /* connection for the statement */
} stmtCacheEntry; } stmtCacheEntry;
static int nextStmtID = 1; static int nextStmtID = 1;
static const int stmtCacheNBuckets = 2039; /* # buckets - a prime # */ static const int stmtCacheNBuckets = 2039; /* # buckets - a prime # */
static const int stmtCacheEntPerBucket = 8; /* # entries/bucket */ static const int stmtCacheEntPerBucket = 8; /* # entries/bucket */
static stmtCacheEntry stmtCacheEntries[16384] = {{0, {0}, 0, 0, 0}}; static stmtCacheEntry stmtCacheEntries[16384] = {{0, {0}, 0, 0, 0}};
static bool deallocate_one(int lineno, enum COMPAT_MODE c, struct connection *con, static bool deallocate_one(int lineno, enum COMPAT_MODE c, struct connection *con,
@ -64,9 +64,9 @@ replace_variables(char **text, int lineno)
ptr += 2; /* skip '::' */ ptr += 2; /* skip '::' */
else else
{ {
/* a rough guess of the size we need: */
int buffersize = sizeof(int) * CHAR_BIT * 10 / 3;
int len; int len;
int buffersize = sizeof(int) * CHAR_BIT * 10 / 3; /* a rough guess of the
* size we need */
char *buffer, char *buffer,
*newcopy; *newcopy;
@ -75,7 +75,8 @@ replace_variables(char **text, int lineno)
snprintf(buffer, buffersize, "$%d", counter++); snprintf(buffer, buffersize, "$%d", counter++);
for (len = 1; (*text)[ptr + len] && isvarchar((*text)[ptr + len]); len++); for (len = 1; (*text)[ptr + len] && isvarchar((*text)[ptr + len]); len++)
/* skip */ ;
if (!(newcopy = (char *) ecpg_alloc(strlen(*text) -len + strlen(buffer) + 1, lineno))) if (!(newcopy = (char *) ecpg_alloc(strlen(*text) -len + strlen(buffer) + 1, lineno)))
{ {
ecpg_free(buffer); ecpg_free(buffer);
@ -158,13 +159,15 @@ prepare_common(int lineno, struct connection *con, const char *name, const char
/* handle the EXEC SQL PREPARE statement */ /* handle the EXEC SQL PREPARE statement */
/* questionmarks is not needed but remains in there for the time being to not change the API */ /* questionmarks is not needed but remains in there for the time being to not change the API */
bool bool
ECPGprepare(int lineno, const char *connection_name, const bool questionmarks, const char *name, const char *variable) ECPGprepare(int lineno, const char *connection_name, const bool questionmarks,
const char *name, const char *variable)
{ {
struct connection *con; struct connection *con;
struct prepared_statement *this, struct prepared_statement *this,
*prev; *prev;
(void) questionmarks; /* quiet the compiler */ (void) questionmarks; /* quiet the compiler */
con = ecpg_get_connection(connection_name); con = ecpg_get_connection(connection_name);
if (!ecpg_init(con, connection_name, lineno)) if (!ecpg_init(con, connection_name, lineno))
@ -185,7 +188,9 @@ ecpg_find_prepared_statement(const char *name,
struct prepared_statement *this, struct prepared_statement *this,
*prev; *prev;
for (this = con->prep_stmts, prev = NULL; this != NULL; prev = this, this = this->next) for (this = con->prep_stmts, prev = NULL;
this != NULL;
prev = this, this = this->next)
{ {
if (strcmp(this->name, name) == 0) if (strcmp(this->name, name) == 0)
{ {
@ -198,7 +203,8 @@ ecpg_find_prepared_statement(const char *name,
} }
static bool static bool
deallocate_one(int lineno, enum COMPAT_MODE c, struct connection *con, struct prepared_statement *prev, struct prepared_statement *this) deallocate_one(int lineno, enum COMPAT_MODE c, struct connection *con,
struct prepared_statement *prev, struct prepared_statement *this)
{ {
bool r = false; bool r = false;
@ -217,7 +223,9 @@ deallocate_one(int lineno, enum COMPAT_MODE c, struct connection *con, struct pr
sprintf(text, "deallocate \"%s\"", this->name); sprintf(text, "deallocate \"%s\"", this->name);
query = PQexec(this->stmt->connection->connection, text); query = PQexec(this->stmt->connection->connection, text);
ecpg_free(text); ecpg_free(text);
if (ecpg_check_PQresult(query, lineno, this->stmt->connection->connection, this->stmt->compat)) if (ecpg_check_PQresult(query, lineno,
this->stmt->connection->connection,
this->stmt->compat))
{ {
PQclear(query); PQclear(query);
r = true; r = true;
@ -288,7 +296,8 @@ ecpg_deallocate_all_conn(int lineno, enum COMPAT_MODE c, struct connection *con)
bool bool
ECPGdeallocate_all(int lineno, int compat, const char *connection_name) ECPGdeallocate_all(int lineno, int compat, const char *connection_name)
{ {
return ecpg_deallocate_all_conn(lineno, compat, ecpg_get_connection(connection_name)); return ecpg_deallocate_all_conn(lineno, compat,
ecpg_get_connection(connection_name));
} }
char * char *
@ -323,9 +332,9 @@ HashStmt(const char *ecpgQuery)
rotVal; rotVal;
stmtLeng = strlen(ecpgQuery); stmtLeng = strlen(ecpgQuery);
hashLeng = 50; /* use 1st 50 characters of statement */ hashLeng = 50; /* use 1st 50 characters of statement */
if (hashLeng > stmtLeng) /* if the statement isn't that long */ if (hashLeng > stmtLeng) /* if the statement isn't that long */
hashLeng = stmtLeng; /* use its actual length */ hashLeng = stmtLeng; /* use its actual length */
hashVal = 0; hashVal = 0;
for (stmtIx = 0; stmtIx < hashLeng; ++stmtIx) for (stmtIx = 0; stmtIx < hashLeng; ++stmtIx)
@ -337,7 +346,7 @@ HashStmt(const char *ecpgQuery)
} }
bucketNo = hashVal % stmtCacheNBuckets; bucketNo = hashVal % stmtCacheNBuckets;
bucketNo += 1; /* don't use bucket # 0 */ bucketNo += 1; /* don't use bucket # 0 */
return (bucketNo * stmtCacheEntPerBucket); return (bucketNo * stmtCacheEntPerBucket);
} }
@ -353,21 +362,21 @@ SearchStmtCache(const char *ecpgQuery)
int entNo, int entNo,
entIx; entIx;
/* hash the statement */ /* hash the statement */
entNo = HashStmt(ecpgQuery); entNo = HashStmt(ecpgQuery);
/* search the cache */ /* search the cache */
for (entIx = 0; entIx < stmtCacheEntPerBucket; ++entIx) for (entIx = 0; entIx < stmtCacheEntPerBucket; ++entIx)
{ {
if (stmtCacheEntries[entNo].stmtID[0]) /* check if entry is in use */ if (stmtCacheEntries[entNo].stmtID[0]) /* check if entry is in use */
{ {
if (strcmp(ecpgQuery, stmtCacheEntries[entNo].ecpgQuery) == 0) if (strcmp(ecpgQuery, stmtCacheEntries[entNo].ecpgQuery) == 0)
break; /* found it */ break; /* found it */
} }
++entNo; /* incr entry # */ ++entNo; /* incr entry # */
} }
/* if entry wasn't found - set entry # to zero */ /* if entry wasn't found - set entry # to zero */
if (entIx >= stmtCacheEntPerBucket) if (entIx >= stmtCacheEntPerBucket)
entNo = 0; entNo = 0;
@ -380,7 +389,8 @@ SearchStmtCache(const char *ecpgQuery)
* OR negative error code * OR negative error code
*/ */
static int static int
ecpg_freeStmtCacheEntry(int lineno, int compat, int entNo) /* entry # to free */ ecpg_freeStmtCacheEntry(int lineno, int compat,
int entNo) /* entry # to free */
{ {
stmtCacheEntry *entry; stmtCacheEntry *entry;
struct connection *con; struct connection *con;
@ -388,19 +398,19 @@ ecpg_freeStmtCacheEntry(int lineno, int compat, int entNo) /* entry # to free */
*prev; *prev;
entry = &stmtCacheEntries[entNo]; entry = &stmtCacheEntries[entNo];
if (!entry->stmtID[0]) /* return if the entry isn't in use */ if (!entry->stmtID[0]) /* return if the entry isn't in use */
return 0; return 0;
con = ecpg_get_connection(entry->connection); con = ecpg_get_connection(entry->connection);
/* free the 'prepared_statement' list entry */ /* free the 'prepared_statement' list entry */
this = ecpg_find_prepared_statement(entry->stmtID, con, &prev); this = ecpg_find_prepared_statement(entry->stmtID, con, &prev);
if (this && !deallocate_one(lineno, compat, con, prev, this)) if (this && !deallocate_one(lineno, compat, con, prev, this))
return -1; return -1;
entry->stmtID[0] = '\0'; entry->stmtID[0] = '\0';
/* free the memory used by the cache entry */ /* free the memory used by the cache entry */
if (entry->ecpgQuery) if (entry->ecpgQuery)
{ {
ecpg_free(entry->ecpgQuery); ecpg_free(entry->ecpgQuery);
@ -415,11 +425,11 @@ ecpg_freeStmtCacheEntry(int lineno, int compat, int entNo) /* entry # to free */
* returns entry # in cache used OR negative error code * returns entry # in cache used OR negative error code
*/ */
static int static int
AddStmtToCache(int lineno, /* line # of statement */ AddStmtToCache(int lineno, /* line # of statement */
const char *stmtID, /* statement ID */ const char *stmtID, /* statement ID */
const char *connection, /* connection */ const char *connection, /* connection */
int compat, /* compatibility level */ int compat, /* compatibility level */
const char *ecpgQuery) /* query */ const char *ecpgQuery) /* query */
{ {
int ix, int ix,
initEntNo, initEntNo,
@ -427,32 +437,35 @@ AddStmtToCache(int lineno, /* line # of statement */
entNo; entNo;
stmtCacheEntry *entry; stmtCacheEntry *entry;
/* hash the statement */ /* hash the statement */
initEntNo = HashStmt(ecpgQuery); initEntNo = HashStmt(ecpgQuery);
/* search for an unused entry */ /* search for an unused entry */
entNo = initEntNo; /* start with the initial entry # for the entNo = initEntNo; /* start with the initial entry # for the
* bucket */ * bucket */
luEntNo = initEntNo; /* use it as the initial 'least used' entry */ luEntNo = initEntNo; /* use it as the initial 'least used' entry */
for (ix = 0; ix < stmtCacheEntPerBucket; ++ix) for (ix = 0; ix < stmtCacheEntPerBucket; ++ix)
{ {
entry = &stmtCacheEntries[entNo]; entry = &stmtCacheEntries[entNo];
if (!entry->stmtID[0]) /* unused entry - use it */ if (!entry->stmtID[0]) /* unused entry - use it */
break; break;
if (entry->execs < stmtCacheEntries[luEntNo].execs) if (entry->execs < stmtCacheEntries[luEntNo].execs)
luEntNo = entNo; /* save new 'least used' entry */ luEntNo = entNo; /* save new 'least used' entry */
++entNo; /* increment entry # */ ++entNo; /* increment entry # */
} }
/* if no unused entries were found - use the 'least used' entry found in the bucket */ /*
if (ix >= stmtCacheEntPerBucket) /* if no unused entries were found */ * if no unused entries were found, re-use the 'least used' entry found in
entNo = luEntNo; /* re-use the 'least used' entry */ * the bucket
*/
if (ix >= stmtCacheEntPerBucket)
entNo = luEntNo;
/* 'entNo' is the entry to use - make sure its free */ /* 'entNo' is the entry to use - make sure its free */
if (ecpg_freeStmtCacheEntry(lineno, compat, entNo) < 0) if (ecpg_freeStmtCacheEntry(lineno, compat, entNo) < 0)
return -1; return -1;
/* add the query to the entry */ /* add the query to the entry */
entry = &stmtCacheEntries[entNo]; entry = &stmtCacheEntries[entNo];
entry->lineno = lineno; entry->lineno = lineno;
entry->ecpgQuery = ecpg_strdup(ecpgQuery, lineno); entry->ecpgQuery = ecpg_strdup(ecpgQuery, lineno);
@ -469,10 +482,10 @@ ecpg_auto_prepare(int lineno, const char *connection_name, const int compat, cha
{ {
int entNo; int entNo;
/* search the statement cache for this statement */ /* search the statement cache for this statement */
entNo = SearchStmtCache(query); entNo = SearchStmtCache(query);
/* if not found - add the statement to the cache */ /* if not found - add the statement to the cache */
if (entNo) if (entNo)
{ {
char *stmtID; char *stmtID;