Mon Sep 18 09:13:32 2006

Asterisk developer's documentation


term.c

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00001 /*
00002  * Asterisk -- An open source telephony toolkit.
00003  *
00004  * Copyright (C) 1999 - 2005, Digium, Inc.
00005  *
00006  * Mark Spencer <markster@digium.com>
00007  *
00008  * See http://www.asterisk.org for more information about
00009  * the Asterisk project. Please do not directly contact
00010  * any of the maintainers of this project for assistance;
00011  * the project provides a web site, mailing lists and IRC
00012  * channels for your use.
00013  *
00014  * This program is free software, distributed under the terms of
00015  * the GNU General Public License Version 2. See the LICENSE file
00016  * at the top of the source tree.
00017  */
00018 
00019 /*! \file
00020  *
00021  * \brief Terminal Routines 
00022  * 
00023  */
00024 
00025 #include <stdio.h>
00026 #include <stdlib.h>
00027 #include <string.h>
00028 #include <sys/time.h>
00029 #include <signal.h>
00030 #include <errno.h>
00031 #include <sys/types.h>
00032 #include <sys/stat.h>
00033 #include <fcntl.h>
00034 #include <unistd.h>
00035 
00036 #include "asterisk.h"
00037 
00038 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 7221 $")
00039 
00040 #include "asterisk/term.h"
00041 #include "asterisk/options.h"
00042 #include "asterisk/lock.h"
00043 #include "asterisk/utils.h"
00044 
00045 static int vt100compat = 0;
00046 
00047 static char prepdata[80] = "";
00048 static char enddata[80] = "";
00049 static char quitdata[80] = "";
00050 
00051 static const char *termpath[] = {
00052    "/usr/share/terminfo",
00053    "/usr/local/share/misc/terminfo",
00054    "/usr/lib/terminfo",
00055    NULL
00056    };
00057 
00058 /* Ripped off from Ross Ridge, but it's public domain code (libmytinfo) */
00059 static short convshort(char *s)
00060 {
00061    register int a,b;
00062 
00063    a = (int) s[0] & 0377;
00064    b = (int) s[1] & 0377;
00065 
00066    if (a == 0377 && b == 0377)
00067       return -1;
00068    if (a == 0376 && b == 0377)
00069       return -2;
00070 
00071    return a + b * 256;
00072 }
00073 
00074 int term_init(void)
00075 {
00076    char *term = getenv("TERM");
00077    char termfile[256] = "";
00078    char buffer[512] = "";
00079    int termfd = -1, parseokay = 0, i;
00080 
00081    if (!term)
00082       return 0;
00083    if (!option_console || option_nocolor || !option_nofork)
00084       return 0;
00085 
00086    for (i=0 ;; i++) {
00087       if (termpath[i] == NULL) {
00088          break;
00089       }
00090       snprintf(termfile, sizeof(termfile), "%s/%c/%s", termpath[i], *term, term);
00091       termfd = open(termfile, O_RDONLY);
00092       if (termfd > -1) {
00093          break;
00094       }
00095    }
00096    if (termfd > -1) {
00097       int actsize = read(termfd, buffer, sizeof(buffer) - 1);
00098       short sz_names = convshort(buffer + 2);
00099       short sz_bools = convshort(buffer + 4);
00100       short n_nums   = convshort(buffer + 6);
00101 
00102       /* if ((sz_names + sz_bools) & 1)
00103          sz_bools++; */
00104 
00105       if (sz_names + sz_bools + n_nums < actsize) {
00106          /* Offset 13 is defined in /usr/include/term.h, though we do not
00107           * include it here, as it conflicts with include/asterisk/term.h */
00108          short max_colors = convshort(buffer + 12 + sz_names + sz_bools + 13 * 2);
00109          if (max_colors > 0) {
00110             vt100compat = 1;
00111          }
00112          parseokay = 1;
00113       }
00114       close(termfd);
00115    }
00116 
00117    if (!parseokay) {
00118       /* These comparisons should not be substrings nor case-insensitive, as
00119        * terminal types are very particular about how they treat suffixes and
00120        * capitalization.  For example, terminal type 'linux-m' does NOT
00121        * support color, while 'linux' does.  Not even all vt100* terminals
00122        * support color, either (e.g. 'vt100+fnkeys'). */
00123       if (!strcmp(term, "linux")) {
00124          vt100compat = 1;
00125       } else if (!strcmp(term, "xterm")) {
00126          vt100compat = 1;
00127       } else if (!strcmp(term, "xterm-color")) {
00128          vt100compat = 1;
00129       } else if (!strncmp(term, "Eterm", 5)) {
00130          /* Both entries which start with Eterm support color */
00131          vt100compat = 1;
00132       } else if (!strcmp(term, "vt100")) {
00133          vt100compat = 1;
00134       } else if (!strncmp(term, "crt", 3)) {
00135          /* Both crt terminals support color */
00136          vt100compat = 1;
00137       }
00138    }
00139 
00140    if (vt100compat) {
00141       /* Make commands show up in nice colors */
00142       snprintf(prepdata, sizeof(prepdata), "%c[%d;%d;%dm", ESC, ATTR_BRIGHT, COLOR_BROWN, COLOR_BLACK + 10);
00143       snprintf(enddata, sizeof(enddata), "%c[%d;%d;%dm", ESC, ATTR_RESET, COLOR_WHITE, COLOR_BLACK + 10);
00144       snprintf(quitdata, sizeof(quitdata), "%c[0m", ESC);
00145    }
00146    return 0;
00147 }
00148 
00149 char *term_color(char *outbuf, const char *inbuf, int fgcolor, int bgcolor, int maxout)
00150 {
00151    int attr=0;
00152    char tmp[40];
00153    if (!vt100compat) {
00154       ast_copy_string(outbuf, inbuf, maxout);
00155       return outbuf;
00156    }
00157    if (!fgcolor && !bgcolor) {
00158       ast_copy_string(outbuf, inbuf, maxout);
00159       return outbuf;
00160    }
00161    if ((fgcolor & 128) && (bgcolor & 128)) {
00162       /* Can't both be highlighted */
00163       ast_copy_string(outbuf, inbuf, maxout);
00164       return outbuf;
00165    }
00166    if (!bgcolor)
00167       bgcolor = COLOR_BLACK;
00168 
00169    if (bgcolor) {
00170       bgcolor &= ~128;
00171       bgcolor += 10;
00172    }
00173    if (fgcolor & 128) {
00174       attr = ATTR_BRIGHT;
00175       fgcolor &= ~128;
00176    }
00177    if (fgcolor && bgcolor) {
00178       snprintf(tmp, sizeof(tmp), "%d;%d", fgcolor, bgcolor);
00179    } else if (bgcolor) {
00180       snprintf(tmp, sizeof(tmp), "%d", bgcolor);
00181    } else if (fgcolor) {
00182       snprintf(tmp, sizeof(tmp), "%d", fgcolor);
00183    }
00184    if (attr) {
00185       snprintf(outbuf, maxout, "%c[%d;%sm%s%c[0;%d;%dm", ESC, attr, tmp, inbuf, ESC, COLOR_WHITE, COLOR_BLACK + 10);
00186    } else {
00187       snprintf(outbuf, maxout, "%c[%sm%s%c[0;%d;%dm", ESC, tmp, inbuf, ESC, COLOR_WHITE, COLOR_BLACK + 10);
00188    }
00189    return outbuf;
00190 }
00191 
00192 char *term_color_code(char *outbuf, int fgcolor, int bgcolor, int maxout)
00193 {
00194    int attr=0;
00195    char tmp[40];
00196    if ((!vt100compat) || (!fgcolor && !bgcolor)) {
00197       *outbuf = '\0';
00198       return outbuf;
00199    }
00200    if ((fgcolor & 128) && (bgcolor & 128)) {
00201       /* Can't both be highlighted */
00202       *outbuf = '\0';
00203       return outbuf;
00204    }
00205    if (!bgcolor)
00206       bgcolor = COLOR_BLACK;
00207 
00208    if (bgcolor) {
00209       bgcolor &= ~128;
00210       bgcolor += 10;
00211    }
00212    if (fgcolor & 128) {
00213       attr = ATTR_BRIGHT;
00214       fgcolor &= ~128;
00215    }
00216    if (fgcolor && bgcolor) {
00217       snprintf(tmp, sizeof(tmp), "%d;%d", fgcolor, bgcolor);
00218    } else if (bgcolor) {
00219       snprintf(tmp, sizeof(tmp), "%d", bgcolor);
00220    } else if (fgcolor) {
00221       snprintf(tmp, sizeof(tmp), "%d", fgcolor);
00222    }
00223    if (attr) {
00224       snprintf(outbuf, maxout, "%c[%d;%sm", ESC, attr, tmp);
00225    } else {
00226       snprintf(outbuf, maxout, "%c[%sm", ESC, tmp);
00227    }
00228    return outbuf;
00229 }
00230 
00231 char *term_strip(char *outbuf, char *inbuf, int maxout)
00232 {
00233    char *outbuf_ptr = outbuf, *inbuf_ptr = inbuf;
00234 
00235    while (outbuf_ptr < outbuf + maxout) {
00236       switch (*inbuf_ptr) {
00237          case ESC:
00238             while (*inbuf_ptr && (*inbuf_ptr != 'm'))
00239                inbuf_ptr++;
00240             break;
00241          default:
00242             *outbuf_ptr = *inbuf_ptr;
00243             outbuf_ptr++;
00244       }
00245       if (! *inbuf_ptr)
00246          break;
00247       inbuf_ptr++;
00248    }
00249    return outbuf;
00250 }
00251 
00252 char *term_prompt(char *outbuf, const char *inbuf, int maxout)
00253 {
00254    if (!vt100compat) {
00255       ast_copy_string(outbuf, inbuf, maxout);
00256       return outbuf;
00257    }
00258    snprintf(outbuf, maxout, "%c[%d;%d;%dm%c%c[%d;%d;%dm%s",
00259       ESC, ATTR_BRIGHT, COLOR_BLUE, COLOR_BLACK + 10,
00260       inbuf[0],
00261       ESC, 0, COLOR_WHITE, COLOR_BLACK + 10,
00262       inbuf + 1);
00263    return outbuf;
00264 }
00265 
00266 char *term_prep(void)
00267 {
00268    return prepdata;
00269 }
00270 
00271 char *term_end(void)
00272 {
00273    return enddata;
00274 }
00275 
00276 char *term_quit(void)
00277 {
00278    return quitdata;
00279 }

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