Wed Oct 28 11:45:42 2009

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  * \author Mark Spencer <markster@digium.com> 
00024  */
00025 
00026 #include "asterisk.h"
00027 
00028 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 106306 $")
00029 
00030 #include "asterisk/_private.h"
00031 #include <sys/time.h>
00032 #include <signal.h>
00033 #include <sys/stat.h>
00034 #include <fcntl.h>
00035 
00036 #include "asterisk/term.h"
00037 #include "asterisk/lock.h"
00038 #include "asterisk/utils.h"
00039 
00040 static int vt100compat;
00041 
00042 static char prepdata[80] = "";
00043 static char enddata[80] = "";
00044 static char quitdata[80] = "";
00045 
00046 static const char *termpath[] = {
00047    "/usr/share/terminfo",
00048    "/usr/local/share/misc/terminfo",
00049    "/usr/lib/terminfo",
00050    NULL
00051    };
00052 
00053 /* Ripped off from Ross Ridge, but it's public domain code (libmytinfo) */
00054 static short convshort(char *s)
00055 {
00056    register int a, b;
00057 
00058    a = (int) s[0] & 0377;
00059    b = (int) s[1] & 0377;
00060 
00061    if (a == 0377 && b == 0377)
00062       return -1;
00063    if (a == 0376 && b == 0377)
00064       return -2;
00065 
00066    return a + b * 256;
00067 }
00068 
00069 int ast_term_init(void)
00070 {
00071    char *term = getenv("TERM");
00072    char termfile[256] = "";
00073    char buffer[512] = "";
00074    int termfd = -1, parseokay = 0, i;
00075 
00076    if (!term)
00077       return 0;
00078    if (!ast_opt_console || ast_opt_no_color || !ast_opt_no_fork)
00079       return 0;
00080 
00081    for (i=0 ;; i++) {
00082       if (termpath[i] == NULL) {
00083          break;
00084       }
00085       snprintf(termfile, sizeof(termfile), "%s/%c/%s", termpath[i], *term, term);
00086       termfd = open(termfile, O_RDONLY);
00087       if (termfd > -1) {
00088          break;
00089       }
00090    }
00091    if (termfd > -1) {
00092       int actsize = read(termfd, buffer, sizeof(buffer) - 1);
00093       short sz_names = convshort(buffer + 2);
00094       short sz_bools = convshort(buffer + 4);
00095       short n_nums   = convshort(buffer + 6);
00096 
00097       /* if ((sz_names + sz_bools) & 1)
00098          sz_bools++; */
00099 
00100       if (sz_names + sz_bools + n_nums < actsize) {
00101          /* Offset 13 is defined in /usr/include/term.h, though we do not
00102           * include it here, as it conflicts with include/asterisk/term.h */
00103          short max_colors = convshort(buffer + 12 + sz_names + sz_bools + 13 * 2);
00104          if (max_colors > 0) {
00105             vt100compat = 1;
00106          }
00107          parseokay = 1;
00108       }
00109       close(termfd);
00110    }
00111 
00112    if (!parseokay) {
00113       /* These comparisons should not be substrings nor case-insensitive, as
00114        * terminal types are very particular about how they treat suffixes and
00115        * capitalization.  For example, terminal type 'linux-m' does NOT
00116        * support color, while 'linux' does.  Not even all vt100* terminals
00117        * support color, either (e.g. 'vt100+fnkeys'). */
00118       if (!strcmp(term, "linux")) {
00119          vt100compat = 1;
00120       } else if (!strcmp(term, "xterm")) {
00121          vt100compat = 1;
00122       } else if (!strcmp(term, "xterm-color")) {
00123          vt100compat = 1;
00124       } else if (!strncmp(term, "Eterm", 5)) {
00125          /* Both entries which start with Eterm support color */
00126          vt100compat = 1;
00127       } else if (!strcmp(term, "vt100")) {
00128          vt100compat = 1;
00129       } else if (!strncmp(term, "crt", 3)) {
00130          /* Both crt terminals support color */
00131          vt100compat = 1;
00132       }
00133    }
00134 
00135    if (vt100compat) {
00136       /* Make commands show up in nice colors */
00137       snprintf(prepdata, sizeof(prepdata), "%c[%d;%d;%dm", ESC, ATTR_BRIGHT, COLOR_BROWN, COLOR_BLACK + 10);
00138       snprintf(enddata, sizeof(enddata), "%c[%d;%d;%dm", ESC, ATTR_RESET, COLOR_WHITE, COLOR_BLACK + 10);
00139       snprintf(quitdata, sizeof(quitdata), "%c[0m", ESC);
00140    }
00141    return 0;
00142 }
00143 
00144 char *term_color(char *outbuf, const char *inbuf, int fgcolor, int bgcolor, int maxout)
00145 {
00146    int attr = 0;
00147    char tmp[40];
00148    if (!vt100compat) {
00149       ast_copy_string(outbuf, inbuf, maxout);
00150       return outbuf;
00151    }
00152    if (!fgcolor && !bgcolor) {
00153       ast_copy_string(outbuf, inbuf, maxout);
00154       return outbuf;
00155    }
00156    if ((fgcolor & 128) && (bgcolor & 128)) {
00157       /* Can't both be highlighted */
00158       ast_copy_string(outbuf, inbuf, maxout);
00159       return outbuf;
00160    }
00161    if (!bgcolor)
00162       bgcolor = COLOR_BLACK;
00163 
00164    if (bgcolor) {
00165       bgcolor &= ~128;
00166       bgcolor += 10;
00167    }
00168    if (fgcolor & 128) {
00169       attr = ATTR_BRIGHT;
00170       fgcolor &= ~128;
00171    }
00172    if (fgcolor && bgcolor) {
00173       snprintf(tmp, sizeof(tmp), "%d;%d", fgcolor, bgcolor);
00174    } else if (bgcolor) {
00175       snprintf(tmp, sizeof(tmp), "%d", bgcolor);
00176    } else if (fgcolor) {
00177       snprintf(tmp, sizeof(tmp), "%d", fgcolor);
00178    }
00179    if (attr) {
00180       snprintf(outbuf, maxout, "%c[%d;%sm%s%c[0;%d;%dm", ESC, attr, tmp, inbuf, ESC, COLOR_WHITE, COLOR_BLACK + 10);
00181    } else {
00182       snprintf(outbuf, maxout, "%c[%sm%s%c[0;%d;%dm", ESC, tmp, inbuf, ESC, COLOR_WHITE, COLOR_BLACK + 10);
00183    }
00184    return outbuf;
00185 }
00186 
00187 char *term_color_code(char *outbuf, int fgcolor, int bgcolor, int maxout)
00188 {
00189    int attr=0;
00190    char tmp[40];
00191    if ((!vt100compat) || (!fgcolor && !bgcolor)) {
00192       *outbuf = '\0';
00193       return outbuf;
00194    }
00195    if ((fgcolor & 128) && (bgcolor & 128)) {
00196       /* Can't both be highlighted */
00197       *outbuf = '\0';
00198       return outbuf;
00199    }
00200    if (!bgcolor)
00201       bgcolor = COLOR_BLACK;
00202 
00203    if (bgcolor) {
00204       bgcolor &= ~128;
00205       bgcolor += 10;
00206    }
00207    if (fgcolor & 128) {
00208       attr = ATTR_BRIGHT;
00209       fgcolor &= ~128;
00210    }
00211    if (fgcolor && bgcolor) {
00212       snprintf(tmp, sizeof(tmp), "%d;%d", fgcolor, bgcolor);
00213    } else if (bgcolor) {
00214       snprintf(tmp, sizeof(tmp), "%d", bgcolor);
00215    } else if (fgcolor) {
00216       snprintf(tmp, sizeof(tmp), "%d", fgcolor);
00217    }
00218    if (attr) {
00219       snprintf(outbuf, maxout, "%c[%d;%sm", ESC, attr, tmp);
00220    } else {
00221       snprintf(outbuf, maxout, "%c[%sm", ESC, tmp);
00222    }
00223    return outbuf;
00224 }
00225 
00226 char *term_strip(char *outbuf, char *inbuf, int maxout)
00227 {
00228    char *outbuf_ptr = outbuf, *inbuf_ptr = inbuf;
00229 
00230    while (outbuf_ptr < outbuf + maxout) {
00231       switch (*inbuf_ptr) {
00232          case ESC:
00233             while (*inbuf_ptr && (*inbuf_ptr != 'm'))
00234                inbuf_ptr++;
00235             break;
00236          default:
00237             *outbuf_ptr = *inbuf_ptr;
00238             outbuf_ptr++;
00239       }
00240       if (! *inbuf_ptr)
00241          break;
00242       inbuf_ptr++;
00243    }
00244    return outbuf;
00245 }
00246 
00247 char *term_prompt(char *outbuf, const char *inbuf, int maxout)
00248 {
00249    if (!vt100compat) {
00250       ast_copy_string(outbuf, inbuf, maxout);
00251       return outbuf;
00252    }
00253    snprintf(outbuf, maxout, "%c[%d;%d;%dm%c%c[%d;%d;%dm%s",
00254       ESC, ATTR_BRIGHT, COLOR_BLUE, COLOR_BLACK + 10,
00255       inbuf[0],
00256       ESC, 0, COLOR_WHITE, COLOR_BLACK + 10,
00257       inbuf + 1);
00258    return outbuf;
00259 }
00260 
00261 /* filter escape sequences */
00262 void term_filter_escapes(char *line)
00263 {
00264    int i;
00265    int len = strlen(line);
00266 
00267    for (i = 0; i < len; i++) {
00268       if (line[i] != ESC)
00269          continue;
00270       if ((i < (len - 2)) &&
00271           (line[i + 1] == 0x5B)) {
00272          switch (line[i + 2]) {
00273          case 0x30:
00274          case 0x31:
00275          case 0x33:
00276             continue;
00277          }
00278       }
00279       /* replace ESC with a space */
00280       line[i] = ' ';
00281    }
00282 }
00283 
00284 char *term_prep(void)
00285 {
00286    return prepdata;
00287 }
00288 
00289 char *term_end(void)
00290 {
00291    return enddata;
00292 }
00293 
00294 char *term_quit(void)
00295 {
00296    return quitdata;
00297 }

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