mdw@git.distorted.org.uk Git - ezmlm/blob - sub_pgsql/opensql.c

   1 /*$Id: opensql.c,v 1.4 1999/11/28 19:55:31 lindberg Exp $*/
   2 /*$Name: ezmlm-idx-040 $*/
   3 #include "stralloc.h"
   4 #include "strerr.h"
   5 #include "errtxt.h"
   6 #include "subscribe.h"
   7 #include <unistd.h>
   8 #include <libpq-fe.h>
   9
  10 static stralloc myp = {0};
  11 static stralloc ers = {0};
  12 static stralloc fn = {0};
  13 static stralloc ourdb = {0};
  14 static char *ourtable = (char *) 0;
  15
  16 char *opensql(dbname,table)
  17 /* reads the file dbname/sql, and if the file exists, parses it into the    */
  18 /* components. The string should be host:port:user:pw:db:table.         If  */
  19 /* the file does not exists, returns "". On success returns NULL. On error  */
  20 /* returns error string for temporary error. If table is NULL it is         */
  21 /* left alone. If *table is not null, it overrides the table in the sql     */
  22 /* file. If we already opended dbname the cached info is used, rather than  */
  23 /* rereading the file. Note that myp is static and all pointers point to it.*/
  24 char *dbname;   /* database directory */
  25 char **table;   /* table root_name */
  26
  27 {
  28   char *host = (char *) 0;
  29   char *port = (char *) 0;
  30   char *db = "ezmlm";           /* default */
  31   char *user = (char *) 0;
  32   char *pw = (char *) 0;
  33   unsigned int j;
  34
  35   if (!stralloc_copys(&fn,dbname)) return ERR_NOMEM;
  36   if (fn.len == ourdb.len && !str_diffn(ourdb.s,fn.s,fn.len)) {
  37     if (table) {
  38       if (*table) ourtable = *table;
  39       else *table = ourtable;
  40     }
  41     return 0;
  42   }
  43   if (!stralloc_cats(&fn,"/sql")) return ERR_NOMEM;
  44   if (!stralloc_0(&fn)) return ERR_NOMEM;
  45                 /* host:port:db:table:user:pw:name */
  46
  47   myp.len = 0;
  48   switch (slurp(fn.s,&myp,128)) {
  49         case -1:        if (!stralloc_copys(&ers,ERR_READ)) return ERR_NOMEM;
  50                         if (!stralloc_cat(&ers,&fn)) return ERR_NOMEM;
  51                         if (!stralloc_0(&ers)) return ERR_NOMEM;
  52                         return ers.s;
  53         case 0: return "";
  54   }
  55   if (!stralloc_copy(&ourdb,&fn)) return ERR_NOMEM;
  56   if (!stralloc_append(&myp,"\n")) return ERR_NOMEM;
  57   for (j=0; j< myp.len; ++j) {
  58     if (myp.s[j] == '\n') { myp.s[j] = '\0'; break; }
  59   }
  60                                                 /* get connection parameters */
  61   if (!stralloc_0(&myp)) return ERR_NOMEM;
  62   host = myp.s;
  63   if (myp.s[j = str_chr(myp.s,':')]) {
  64     port = myp.s + j++;
  65     *(port++) = '\0';
  66     if (myp.s[j += str_chr(myp.s+j,':')]) {
  67       user = myp.s + j++;
  68       *(user++) = '\0';
  69       if (myp.s[j += str_chr(myp.s+j,':')]) {
  70         pw = myp.s + j++;
  71         *(pw++) = '\0';
  72         if (myp.s[j += str_chr(myp.s+j,':')]) {
  73           db = myp.s + j++;
  74           *(db++) = '\0';
  75           if (myp.s[j += str_chr(myp.s+j,':')]) {
  76             ourtable = myp.s + j++;
  77             *(ourtable++) = '\0';
  78           }
  79         }
  80       }
  81     }
  82   }
  83
  84   if (host && !*host) host = (char *) 0;
  85   if (user && !*user) user = (char *) 0;
  86   if (pw && !*pw) pw = (char *) 0;
  87   if (db && !*db) db = (char *) 0;
  88   if (ourtable && !*ourtable) ourtable = (char *) 0;
  89   if (table) {
  90     if (*table) ourtable = *table;
  91     else *table = ourtable;
  92     if (!*table) return ERR_NO_TABLE;
  93   }
  94   if (!psql) {
  95     /* Make connection to database */
  96     psql = PQsetdbLogin( host, port, NULL, NULL, db, user, pw);
  97     /* Check  to see that the backend connection was successfully made */
  98     if (PQstatus(psql) == CONNECTION_BAD)
  99       return PQerrorMessage(psql);
 100   }
 101   return (char *) 0;
 102 }
 103
 104 void closesql()
 105 /* close connection to SQL server, if open */
 106 {
 107   if (psql) PQfinish(psql);
 108   psql = (void *) 0; /* Destroy pointer */
 109   return;
 110 }
 111