329 lines
6.9 KiB
C
329 lines
6.9 KiB
C
/*
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* psql - the PostgreSQL interactive terminal
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*
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* Copyright 2000 by PostgreSQL Global Development Group
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*
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* $Header: /cvsroot/pgsql/src/bin/psql/prompt.c,v 1.17 2001/02/10 02:31:28 tgl Exp $
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*/
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#include "postgres_fe.h"
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#include "prompt.h"
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#include "libpq-fe.h"
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#include "settings.h"
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#include "common.h"
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#include "variables.h"
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#ifdef WIN32
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#include <io.h>
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#include <win32.h>
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#endif
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#ifdef HAVE_UNIX_SOCKETS
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# include <unistd.h>
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# include <netdb.h>
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#endif
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/*--------------------------
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* get_prompt
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*
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* Returns a statically allocated prompt made by interpolating certain
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* tcsh style escape sequences into pset.vars "PROMPT1|2|3".
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* (might not be completely multibyte safe)
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*
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* Defined interpolations are:
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* %M - database server "hostname.domainname" (or "localhost" if this
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* information is not available)
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* %m - like %M, but hostname only (before first dot)
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* %> - database server port number
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* %n - database user name
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* %/ - current database
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* %~ - like %/ but "~" when database name equals user name
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* %# - "#" if superuser, ">" otherwise
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* %R - in prompt1 normally =, or ^ if single line mode,
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* or a ! if session is not connected to a database;
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* in prompt2 -, *, ', or ";
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* in prompt3 nothing
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* %? - the error code of the last query (not yet implemented)
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* %% - a percent sign
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*
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* %[0-9] - the character with the given decimal code
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* %0[0-7] - the character with the given octal code
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* %0x[0-9A-Fa-f] - the character with the given hexadecimal code
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*
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* %`command` - The result of executing command in /bin/sh with trailing
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* newline stripped.
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* %:name: - The value of the psql variable 'name'
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* (those will not be rescanned for more escape sequences!)
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*
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* If the application-wide prompts became NULL somehow, the returned string
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* will be empty (not NULL!).
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*--------------------------
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*/
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/*
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* We need hostname information, only if connection is via UNIX socket
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*/
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#ifdef HAVE_UNIX_SOCKETS
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#define DOMAINNAME 1
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#define HOSTNAME 2
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/*
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* Return full hostname for localhost.
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* - informations are init only in firts time - not queries DNS or NIS
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* for every localhost() call
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*/
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static char *
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localhost(int type, char *buf, int siz)
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{
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static struct hostent *hp = NULL;
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static int err = 0;
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if (hp == NULL && err == 0)
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{
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char hname[256];
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if (gethostname(hname, 256) == 0)
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{
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if (!(hp = gethostbyname(hname)))
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err = 1;
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}
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else
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err = 1;
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}
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if (hp == NULL)
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return strncpy(buf, "localhost", siz);
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strncpy(buf, hp->h_name, siz); /* full aaa.bbb.ccc */
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if (type == HOSTNAME)
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buf[strcspn(buf, ".")] = '\0';
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return buf;
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}
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#endif /* HAVE_UNIX_SOCKETS */
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char *
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get_prompt(promptStatus_t status)
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{
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#define MAX_PROMPT_SIZE 256
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static char destination[MAX_PROMPT_SIZE + 1];
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char buf[MAX_PROMPT_SIZE + 1];
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bool esc = false;
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const char *p;
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const char *prompt_string;
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if (status == PROMPT_READY)
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prompt_string = GetVariable(pset.vars, "PROMPT1");
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else if (status == PROMPT_CONTINUE || status == PROMPT_SINGLEQUOTE || status == PROMPT_DOUBLEQUOTE || status == PROMPT_COMMENT || status == PROMPT_PAREN)
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prompt_string = GetVariable(pset.vars, "PROMPT2");
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else if (status == PROMPT_COPY)
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prompt_string = GetVariable(pset.vars, "PROMPT3");
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else
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prompt_string = "? ";
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destination[0] = '\0';
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for (p = prompt_string;
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p && *p && strlen(destination) < MAX_PROMPT_SIZE;
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p++)
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{
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memset(buf, 0, MAX_PROMPT_SIZE + 1);
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if (esc)
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{
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switch (*p)
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{
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case '%':
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strcpy(buf, "%");
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break;
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/* Current database */
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case '/':
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if (pset.db)
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strncpy(buf, PQdb(pset.db), MAX_PROMPT_SIZE);
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break;
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case '~':
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{
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const char *var;
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if (pset.db)
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{
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if (strcmp(PQdb(pset.db), PQuser(pset.db)) == 0 ||
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((var = getenv("PGDATABASE")) && strcmp(var, PQdb(pset.db)) == 0))
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strcpy(buf, "~");
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else
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strncpy(buf, PQdb(pset.db), MAX_PROMPT_SIZE);
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}
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break;
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}
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/* DB server hostname (long/short) */
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case 'M':
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case 'm':
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if (pset.db)
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{
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/* INET socket */
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if (PQhost(pset.db))
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{
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strncpy(buf, PQhost(pset.db), MAX_PROMPT_SIZE);
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if (*p == 'm')
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buf[strcspn(buf, ".")] = '\0';
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}
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/* UNIX socket */
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#ifdef HAVE_UNIX_SOCKETS
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else
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{
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if (*p == 'm')
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localhost(HOSTNAME, buf, MAX_PROMPT_SIZE);
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else
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localhost(DOMAINNAME, buf, MAX_PROMPT_SIZE);
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}
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#endif /* HAVE_UNIX_SOCKETS */
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}
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break;
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/* DB server port number */
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case '>':
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if (pset.db && PQport(pset.db))
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strncpy(buf, PQport(pset.db), MAX_PROMPT_SIZE);
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break;
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/* DB server user name */
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case 'n':
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if (pset.db)
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strncpy(buf, PQuser(pset.db), MAX_PROMPT_SIZE);
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break;
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case '0':
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case '1':
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case '2':
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case '3':
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case '4':
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case '5':
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case '6':
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case '7':
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case '8':
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case '9':
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{
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long int l;
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char *end;
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l = strtol(p, &end, 0);
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sprintf(buf, "%c", (unsigned char) l);
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p = end - 1;
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break;
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}
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case 'R':
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switch (status)
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{
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case PROMPT_READY:
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if (!pset.db)
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buf[0] = '!';
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else if (!GetVariableBool(pset.vars, "SINGLELINE"))
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buf[0] = '=';
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else
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buf[0] = '^';
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break;
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case PROMPT_CONTINUE:
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buf[0] = '-';
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break;
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case PROMPT_SINGLEQUOTE:
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buf[0] = '\'';
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break;
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case PROMPT_DOUBLEQUOTE:
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buf[0] = '"';
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break;
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case PROMPT_COMMENT:
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buf[0] = '*';
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break;
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case PROMPT_PAREN:
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buf[0] = '(';
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break;
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default:
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buf[0] = '\0';
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break;
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}
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case '?':
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/* not here yet */
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break;
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case '#':
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{
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if (pset.issuper)
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buf[0] = '#';
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else
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buf[0] = '>';
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break;
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}
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/* execute command */
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case '`':
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{
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FILE *fd = NULL;
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char *file = strdup(p + 1);
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int cmdend;
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cmdend = strcspn(file, "`");
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file[cmdend] = '\0';
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if (file)
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fd = popen(file, "r");
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if (fd)
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{
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fgets(buf, MAX_PROMPT_SIZE - 1, fd);
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pclose(fd);
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}
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if (strlen(buf) > 0 && buf[strlen(buf) - 1] == '\n')
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buf[strlen(buf) - 1] = '\0';
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free(file);
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p += cmdend + 1;
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break;
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}
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/* interpolate variable */
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case ':':
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{
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char *name;
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const char *val;
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int nameend;
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name = strdup(p + 1);
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nameend = strcspn(name, ":");
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name[nameend] = '\0';
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val = GetVariable(pset.vars, name);
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if (val)
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strncpy(buf, val, MAX_PROMPT_SIZE);
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free(name);
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p += nameend + 1;
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break;
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}
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default:
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buf[0] = *p;
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buf[1] = '\0';
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}
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esc = false;
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}
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else if (*p == '%')
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esc = true;
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else
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{
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buf[0] = *p;
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buf[1] = '\0';
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esc = false;
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}
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if (!esc)
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strncat(destination, buf, MAX_PROMPT_SIZE - strlen(destination));
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}
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destination[MAX_PROMPT_SIZE] = '\0';
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return destination;
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}
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