4.3BSD - /usr/src/new/spms/src/lib/libpdb/src/mustopenpdb.c

   1: /* $Header$ */
   2: 
   3: /*
   4:  * Author: Peter J. Nicklin
   5:  */
   6: 
   7: /*
   8:  * mustopenpdb() opens a database in the manner of openpdb(). However, if the
   9:  * database cannot be accessed, exit(1) is called.
  10:  */
  11: #include <stdio.h>
  12: #include "null.h"
  13: #include "path.h"
  14: #include "pdb.h"
  15: #include "system.h"
  16: #include "yesno.h"
  17: 
  18: PDB *
  19: mustopenpdb(name, path, mode)
  20:     char *name;         /* database name */
  21:     char *path;         /* directory pathname to database */
  22:     register char *mode;        /* mode of access */
  23: {
  24:     char *malloc();         /* memory allocator */
  25:     char *pathcat();        /* pathname concatenation */
  26:     char *strcat();         /* string concatenation */
  27:     char *strcpy();         /* string copy */
  28:     char *strncpy();        /* string copy n characters */
  29:     char tname[15];         /* temporary database name */
  30:     FILE *fopen();          /* open file */
  31:     PDB *pdbp;          /* database stream */
  32: 
  33:     if ((pdbp = (PDB *) malloc(sizeof(PDB))) == NULL)
  34:         fatal("out of memory");
  35:     pathcat(pdbp->path, path, name);
  36:     if (mode[0]=='r' && mode[1]=='\0')
  37:         {
  38:         if ((pdbp->fp = fopen(pdbp->path, mode)) == NULL)
  39:             {
  40:             pperror(pdbp->path);
  41:             exit(1);
  42:             }
  43:         }
  44:     else if (mode[0]=='w' || mode[0]=='a' || (mode[0]=='r' && mode[1]=='w'))
  45:         {
  46:         strncpy(tname, name, 8);
  47:         tname[8] = '\0';
  48:         strcat(tname, "_temp");
  49:         pathcat(pdbp->tpath, path, tname);
  50:         if (FILEXIST(pdbp->tpath))
  51:             fatal("%s temporarily unavailable", pdbp->path);
  52:         if ((pdbp->fp = fopen(pdbp->path, mode)) == NULL)
  53:             {
  54:             pperror(pdbp->path);
  55:             exit(1);
  56:             }
  57:         if ((pdbp->tfp = fopen(pdbp->tpath, "w")) == NULL)
  58:             {
  59:             pperror(pdbp->path);
  60:             exit(1);
  61:             }
  62:         if (mode[0]=='w' || mode[0]=='a')
  63:             fclose(pdbp->tfp);
  64:         }
  65:     else
  66:         fatal("bad mode %s opening %s", mode, pdbp->path);
  67:     pdbp->flag &= ~(_PACCESS|_PSTAT);
  68:     switch (*mode)
  69:         {
  70:         case 'r':
  71:             pdbp->flag |= _PREAD;
  72:             if (mode[1] != 'w')
  73:                 break;
  74:         case 'w':
  75:             pdbp->flag |= _PWRITE;
  76:             break;
  77:         case 'a':
  78:             pdbp->flag |= _PAPPEND | _PEOF;
  79:             break;
  80:         }
  81:     strcpy(pdbp->root, path);
  82:     return(pdbp);
  83: }

Defined functions