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Diffstat (limited to 'parse-colors.c')
| -rw-r--r-- | parse-colors.c | 440 |
1 files changed, 440 insertions, 0 deletions
diff --git a/parse-colors.c b/parse-colors.c new file mode 100644 index 0000000..05ec9bc --- /dev/null +++ b/parse-colors.c @@ -0,0 +1,440 @@ +/* `dir', `vdir' and `ls' directory listing programs for GNU. + + Modified by Chet Ramey for Readline. + + Copyright (C) 1985, 1988, 1990-1991, 1995-2010, 2012, 2017 + Free Software Foundation, Inc. + + This program is free software: you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation, either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +/* Written by Richard Stallman and David MacKenzie. */ + +/* Color support by Peter Anvin <Peter.Anvin@linux.org> and Dennis + Flaherty <dennisf@denix.elk.miles.com> based on original patches by + Greg Lee <lee@uhunix.uhcc.hawaii.edu>. */ + +#define READLINE_LIBRARY + +#if defined (HAVE_CONFIG_H) +# include <config.h> +#endif + +#include <stdio.h> + +// strdup() / strcpy() +#if defined (HAVE_STRING_H) +# include <string.h> +#else /* !HAVE_STRING_H */ +# include <strings.h> +#endif /* !HAVE_STRING_H */ + +// abort() +#if defined (HAVE_STDLIB_H) +# include <stdlib.h> +#else +# include "ansi_stdlib.h" +#endif /* HAVE_STDLIB_H */ + +#include "rldefs.h" // STREQ, savestring +#include "readline.h" +#include "rlprivate.h" +#include "rlshell.h" +#include "xmalloc.h" + +#include "colors.h" +#include "parse-colors.h" + +#if defined (COLOR_SUPPORT) + +static bool get_funky_string (char **dest, const char **src, bool equals_end, size_t *output_count); + +struct bin_str _rl_color_indicator[] = + { + { LEN_STR_PAIR ("\033[") }, // lc: Left of color sequence + { LEN_STR_PAIR ("m") }, // rc: Right of color sequence + { 0, NULL }, // ec: End color (replaces lc+no+rc) + { LEN_STR_PAIR ("0") }, // rs: Reset to ordinary colors + { 0, NULL }, // no: Normal + { 0, NULL }, // fi: File: default + { LEN_STR_PAIR ("01;34") }, // di: Directory: bright blue + { LEN_STR_PAIR ("01;36") }, // ln: Symlink: bright cyan + { LEN_STR_PAIR ("33") }, // pi: Pipe: yellow/brown + { LEN_STR_PAIR ("01;35") }, // so: Socket: bright magenta + { LEN_STR_PAIR ("01;33") }, // bd: Block device: bright yellow + { LEN_STR_PAIR ("01;33") }, // cd: Char device: bright yellow + { 0, NULL }, // mi: Missing file: undefined + { 0, NULL }, // or: Orphaned symlink: undefined + { LEN_STR_PAIR ("01;32") }, // ex: Executable: bright green + { LEN_STR_PAIR ("01;35") }, // do: Door: bright magenta + { LEN_STR_PAIR ("37;41") }, // su: setuid: white on red + { LEN_STR_PAIR ("30;43") }, // sg: setgid: black on yellow + { LEN_STR_PAIR ("37;44") }, // st: sticky: black on blue + { LEN_STR_PAIR ("34;42") }, // ow: other-writable: blue on green + { LEN_STR_PAIR ("30;42") }, // tw: ow w/ sticky: black on green + { LEN_STR_PAIR ("30;41") }, // ca: black on red + { 0, NULL }, // mh: disabled by default + { LEN_STR_PAIR ("\033[K") }, // cl: clear to end of line + }; + +/* Parse a string as part of the LS_COLORS variable; this may involve + decoding all kinds of escape characters. If equals_end is set an + unescaped equal sign ends the string, otherwise only a : or \0 + does. Set *OUTPUT_COUNT to the number of bytes output. Return + true if successful. + + The resulting string is *not* null-terminated, but may contain + embedded nulls. + + Note that both dest and src are char **; on return they point to + the first free byte after the array and the character that ended + the input string, respectively. */ + +static bool +get_funky_string (char **dest, const char **src, bool equals_end, size_t *output_count) { + char num; /* For numerical codes */ + size_t count; /* Something to count with */ + enum { + ST_GND, ST_BACKSLASH, ST_OCTAL, ST_HEX, ST_CARET, ST_END, ST_ERROR + } state; + const char *p; + char *q; + + p = *src; /* We don't want to double-indirect */ + q = *dest; /* the whole darn time. */ + + count = 0; /* No characters counted in yet. */ + num = 0; + + state = ST_GND; /* Start in ground state. */ + while (state < ST_END) + { + switch (state) + { + case ST_GND: /* Ground state (no escapes) */ + switch (*p) + { + case ':': + case '\0': + state = ST_END; /* End of string */ + break; + case '\\': + state = ST_BACKSLASH; /* Backslash scape sequence */ + ++p; + break; + case '^': + state = ST_CARET; /* Caret escape */ + ++p; + break; + case '=': + if (equals_end) + { + state = ST_END; /* End */ + break; + } + /* else fall through */ + default: + *(q++) = *(p++); + ++count; + break; + } + break; + + case ST_BACKSLASH: /* Backslash escaped character */ + switch (*p) + { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + state = ST_OCTAL; /* Octal sequence */ + num = *p - '0'; + break; + case 'x': + case 'X': + state = ST_HEX; /* Hex sequence */ + num = 0; + break; + case 'a': /* Bell */ + num = '\a'; + break; + case 'b': /* Backspace */ + num = '\b'; + break; + case 'e': /* Escape */ + num = 27; + break; + case 'f': /* Form feed */ + num = '\f'; + break; + case 'n': /* Newline */ + num = '\n'; + break; + case 'r': /* Carriage return */ + num = '\r'; + break; + case 't': /* Tab */ + num = '\t'; + break; + case 'v': /* Vtab */ + num = '\v'; + break; + case '?': /* Delete */ + num = 127; + break; + case '_': /* Space */ + num = ' '; + break; + case '\0': /* End of string */ + state = ST_ERROR; /* Error! */ + break; + default: /* Escaped character like \ ^ : = */ + num = *p; + break; + } + if (state == ST_BACKSLASH) + { + *(q++) = num; + ++count; + state = ST_GND; + } + ++p; + break; + + case ST_OCTAL: /* Octal sequence */ + if (*p < '0' || *p > '7') + { + *(q++) = num; + ++count; + state = ST_GND; + } + else + num = (num << 3) + (*(p++) - '0'); + break; + + case ST_HEX: /* Hex sequence */ + switch (*p) + { + case '0': + case '1': + case '2': + case '3': + case '4': + case '5': + case '6': + case '7': + case '8': + case '9': + num = (num << 4) + (*(p++) - '0'); + break; + case 'a': + case 'b': + case 'c': + case 'd': + case 'e': + case 'f': + num = (num << 4) + (*(p++) - 'a') + 10; + break; + case 'A': + case 'B': + case 'C': + case 'D': + case 'E': + case 'F': + num = (num << 4) + (*(p++) - 'A') + 10; + break; + default: + *(q++) = num; + ++count; + state = ST_GND; + break; + } + break; + + case ST_CARET: /* Caret escape */ + state = ST_GND; /* Should be the next state... */ + if (*p >= '@' && *p <= '~') + { + *(q++) = *(p++) & 037; + ++count; + } + else if (*p == '?') + { + *(q++) = 127; + ++count; + } + else + state = ST_ERROR; + break; + + default: + /* should we ? */ + /* abort (); no, we should not */ + state = ST_ERROR; + break; + } + } + + *dest = q; + *src = p; + *output_count = count; + + return state != ST_ERROR; +} +#endif /* COLOR_SUPPORT */ + +void _rl_parse_colors(void) +{ +#if defined (COLOR_SUPPORT) + const char *p; /* Pointer to character being parsed */ + char *buf; /* color_buf buffer pointer */ + int state; /* State of parser */ + int ind_no; /* Indicator number */ + char label[3]; /* Indicator label */ + COLOR_EXT_TYPE *ext; /* Extension we are working on */ + + p = sh_get_env_value ("LS_COLORS"); + if (p == 0 || *p == '\0') + { + _rl_color_ext_list = NULL; + return; + } + + ext = NULL; + strcpy (label, "??"); + + /* This is an overly conservative estimate, but any possible + LS_COLORS string will *not* generate a color_buf longer than + itself, so it is a safe way of allocating a buffer in + advance. */ + buf = color_buf = savestring (p); + + state = 1; + while (state > 0) + { + switch (state) + { + case 1: /* First label character */ + switch (*p) + { + case ':': + ++p; + break; + + case '*': + /* Allocate new extension block and add to head of + linked list (this way a later definition will + override an earlier one, which can be useful for + having terminal-specific defs override global). */ + + ext = (COLOR_EXT_TYPE *)xmalloc (sizeof *ext); + ext->next = _rl_color_ext_list; + _rl_color_ext_list = ext; + + ++p; + ext->ext.string = buf; + + state = (get_funky_string (&buf, &p, true, &ext->ext.len) + ? 4 : -1); + break; + + case '\0': + state = 0; /* Done! */ + break; + + default: /* Assume it is file type label */ + label[0] = *(p++); + state = 2; + break; + } + break; + + case 2: /* Second label character */ + if (*p) + { + label[1] = *(p++); + state = 3; + } + else + state = -1; /* Error */ + break; + + case 3: /* Equal sign after indicator label */ + state = -1; /* Assume failure... */ + if (*(p++) == '=')/* It *should* be... */ + { + for (ind_no = 0; indicator_name[ind_no] != NULL; ++ind_no) + { + if (STREQ (label, indicator_name[ind_no])) + { + _rl_color_indicator[ind_no].string = buf; + state = (get_funky_string (&buf, &p, false, + &_rl_color_indicator[ind_no].len) + ? 1 : -1); + break; + } + } + if (state == -1) + { + _rl_errmsg ("LS_COLORS: unrecognized prefix: %s", label); + /* recover from an unrecognized prefix */ + while (p && *p && *p != ':') + p++; + if (p && *p == ':') + state = 1; + else if (p && *p == 0) + state = 0; + } + } + break; + + case 4: /* Equal sign after *.ext */ + if (*(p++) == '=') + { + ext->seq.string = buf; + state = (get_funky_string (&buf, &p, false, &ext->seq.len) + ? 1 : -1); + } + else + state = -1; + /* XXX - recover here as with an unrecognized prefix? */ + if (state == -1 && ext->ext.string) + _rl_errmsg ("LS_COLORS: syntax error: %s", ext->ext.string); + break; + } + } + + if (state < 0) + { + COLOR_EXT_TYPE *e; + COLOR_EXT_TYPE *e2; + + _rl_errmsg ("unparsable value for LS_COLORS environment variable"); + free (color_buf); + for (e = _rl_color_ext_list; e != NULL; /* empty */) + { + e2 = e; + e = e->next; + free (e2); + } + _rl_color_ext_list = NULL; + _rl_colored_stats = 0; /* can't have colored stats without colors */ + } +#else /* !COLOR_SUPPORT */ + ; +#endif /* !COLOR_SUPPORT */ +} |