/* vi: set sw=4 ts=4: */ /* * cut.c - minimalist version of cut * * Copyright (C) 1999,2000,2001 by Lineo, inc. * Written by Mark Whitley * debloated by Bernhard Reutner-Fischer * * Licensed under GPLv2 or later, see file LICENSE in this source tree. */ //config:config CUT //config: bool "cut (6.7 kb)" //config: default y //config: help //config: cut is used to print selected parts of lines from //config: each file to stdout. //config: //config:config FEATURE_CUT_REGEX //config: bool "cut -F" //config: default y //config: depends on CUT //config: help //config: Allow regex based delimiters. //applet:IF_CUT(APPLET_NOEXEC(cut, cut, BB_DIR_USR_BIN, BB_SUID_DROP, cut)) //kbuild:lib-$(CONFIG_CUT) += cut.o //usage:#define cut_trivial_usage //usage: "[OPTIONS] [FILE]..." //usage:#define cut_full_usage "\n\n" //usage: "Print selected fields from FILEs to stdout\n" //usage: "\n -b LIST Output only bytes from LIST" //usage: "\n -c LIST Output only characters from LIST" //usage: "\n -d SEP Field delimiter for input (default -f TAB, -F run of whitespace)" //usage: "\n -O SEP Field delimeter for output (default = -d for -f, one space for -F)" //usage: "\n -D Don't sort/collate sections or match -fF lines without delimeter" //usage: "\n -f LIST Print only these fields (-d is single char)" //usage: IF_FEATURE_CUT_REGEX( //usage: "\n -F LIST Print only these fields (-d is regex)" //usage: ) //usage: "\n -s Output only lines containing delimiter" //usage: "\n -n Ignored" //(manpage:-n with -b: don't split multibyte characters) //usage: //usage:#define cut_example_usage //usage: "$ echo \"Hello world\" | cut -f 1 -d ' '\n" //usage: "Hello\n" //usage: "$ echo \"Hello world\" | cut -f 2 -d ' '\n" //usage: "world\n" #include "libbb.h" #if ENABLE_FEATURE_CUT_REGEX #include "xregex.h" #else #define regex_t int typedef struct { int rm_eo, rm_so; } regmatch_t; #define xregcomp(x, ...) *(x) = 0 #define regexec(...) 0 #endif /* This is a NOEXEC applet. Be very careful! */ /* option vars */ #define OPT_STR "b:c:f:d:O:sD"IF_FEATURE_CUT_REGEX("F:")"n" #define CUT_OPT_BYTE_FLGS (1 << 0) #define CUT_OPT_CHAR_FLGS (1 << 1) #define CUT_OPT_FIELDS_FLGS (1 << 2) #define CUT_OPT_DELIM_FLGS (1 << 3) #define CUT_OPT_ODELIM_FLGS (1 << 4) #define CUT_OPT_SUPPRESS_FLGS (1 << 5) #define CUT_OPT_NOSORT_FLGS (1 << 6) #define CUT_OPT_REGEX_FLGS ((1 << 7) * ENABLE_FEATURE_CUT_REGEX) struct cut_list { int startpos; int endpos; }; static int cmpfunc(const void *a, const void *b) { return (((struct cut_list *) a)->startpos - ((struct cut_list *) b)->startpos); } static void cut_file(FILE *file, const char *delim, const char *odelim, const struct cut_list *cut_lists, unsigned nlists) { char *line; unsigned linenum = 0; /* keep these zero-based to be consistent */ regex_t reg; int spos, shoe = option_mask32 & CUT_OPT_REGEX_FLGS; if (shoe) xregcomp(®, delim, REG_EXTENDED); /* go through every line in the file */ while ((line = xmalloc_fgetline(file)) != NULL) { /* set up a list so we can keep track of what's been printed */ int linelen = strlen(line); char *printed = xzalloc(linelen + 1); char *orig_line = line; unsigned cl_pos = 0; /* cut based on chars/bytes XXX: only works when sizeof(char) == byte */ if (option_mask32 & (CUT_OPT_CHAR_FLGS | CUT_OPT_BYTE_FLGS)) { /* print the chars specified in each cut list */ for (; cl_pos < nlists; cl_pos++) { for (spos = cut_lists[cl_pos].startpos; spos < linelen;) { if (!printed[spos]) { printed[spos] = 'X'; putchar(line[spos]); } if (++spos > cut_lists[cl_pos].endpos) { break; } } } } else if (*delim == '\n') { /* cut by lines */ spos = cut_lists[cl_pos].startpos; /* get out if we have no more lists to process or if the lines * are lower than what we're interested in */ if (((int)linenum < spos) || (cl_pos >= nlists)) goto next_line; /* if the line we're looking for is lower than the one we were * passed, it means we displayed it already, so move on */ while (spos < (int)linenum) { spos++; /* go to the next list if we're at the end of this one */ if (spos > cut_lists[cl_pos].endpos) { cl_pos++; /* get out if there's no more lists to process */ if (cl_pos >= nlists) goto next_line; spos = cut_lists[cl_pos].startpos; /* get out if the current line is lower than the one * we just became interested in */ if ((int)linenum < spos) goto next_line; } } /* If we made it here, it means we've found the line we're * looking for, so print it */ puts(line); goto next_line; } else { /* cut by fields */ unsigned uu = 0, start = 0, end = 0, out = 0; int dcount = 0; /* Loop through bytes, finding next delimiter */ for (;;) { /* End of current range? */ if (end == linelen || dcount > cut_lists[cl_pos].endpos) { if (++cl_pos >= nlists) break; if (option_mask32 & CUT_OPT_NOSORT_FLGS) start = dcount = uu = 0; end = 0; } /* End of current line? */ if (uu == linelen) { /* If we've seen no delimiters, check -s */ if (!cl_pos && !dcount && !shoe) { if (option_mask32 & CUT_OPT_SUPPRESS_FLGS) goto next_line; } else if (dcount < cut_lists[cl_pos].startpos) start = linelen; end = linelen; } else { /* Find next delimiter */ if (shoe) { regmatch_t rr = {-1, -1}; if (!regexec(®, line+uu, 1, &rr, REG_NOTBOL|REG_NOTEOL)) { end = uu + rr.rm_so; uu += rr.rm_eo; } else { uu = linelen; continue; } } else if (line[end = uu++] != *delim) continue; /* Got delimiter. Loop if not yet within range. */ if (dcount++ < cut_lists[cl_pos].startpos) { start = uu; continue; } } if (end != start || !shoe) printf("%s%.*s", out++ ? odelim : "", end-start, line + start); start = uu; if (!dcount) break; } } /* if we printed anything, finish with newline */ putchar('\n'); next_line: linenum++; free(printed); free(orig_line); } } int cut_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int cut_main(int argc UNUSED_PARAM, char **argv) { /* growable array holding a series of lists */ struct cut_list *cut_lists = NULL; unsigned nlists = 0; /* number of elements in above list */ char *sopt, *ltok; const char *delim = NULL; const char *odelim = NULL; unsigned opt; #define ARG "bcf"IF_FEATURE_CUT_REGEX("F") opt = getopt32(argv, "^" OPT_STR // = "b:c:f:d:O:sD"IF_FEATURE_CUT_REGEX("F:")"n" "\0" "b--"ARG":c--"ARG":f--"ARG IF_FEATURE_CUT_REGEX("F--"ARG), &sopt, &sopt, &sopt, &delim, &odelim IF_FEATURE_CUT_REGEX(, &sopt) ); if (!delim || !*delim) delim = (opt & CUT_OPT_REGEX_FLGS) ? "[[:space:]]+" : "\t"; if (!odelim) odelim = (opt & CUT_OPT_REGEX_FLGS) ? " " : delim; // argc -= optind; argv += optind; if (!(opt & (CUT_OPT_BYTE_FLGS | CUT_OPT_CHAR_FLGS | CUT_OPT_FIELDS_FLGS | CUT_OPT_REGEX_FLGS))) bb_simple_error_msg_and_die("expected a list of bytes, characters, or fields"); /* non-field (char or byte) cutting has some special handling */ if (!(opt & (CUT_OPT_FIELDS_FLGS|CUT_OPT_REGEX_FLGS))) { static const char _op_on_field[] ALIGN1 = " only when operating on fields"; if (opt & CUT_OPT_SUPPRESS_FLGS) { bb_error_msg_and_die ("suppressing non-delimited lines makes sense%s", _op_on_field); } if (opt & CUT_OPT_DELIM_FLGS) { bb_error_msg_and_die ("a delimiter may be specified%s", _op_on_field); } } /* * parse list and put values into startpos and endpos. * valid list formats: N, N-, N-M, -M * more than one list can be separated by commas */ { char *ntok; int s = 0, e = 0; /* take apart the lists, one by one (they are separated with commas) */ while ((ltok = strsep(&sopt, ",")) != NULL) { /* it's actually legal to pass an empty list */ if (!ltok[0]) continue; /* get the start pos */ ntok = strsep(<ok, "-"); if (!ntok[0]) { s = 0; } else { s = xatoi_positive(ntok); /* account for the fact that arrays are zero based, while * the user expects the first char on the line to be char #1 */ if (s != 0) s--; } /* get the end pos */ if (ltok == NULL) { e = s; } else if (!ltok[0]) { e = INT_MAX; } else { e = xatoi_positive(ltok); /* if the user specified and end position of 0, * that means "til the end of the line" */ if (!*ltok) e = INT_MAX; else if (e < s) bb_error_msg_and_die("%d<%d", e, s); e--; /* again, arrays are zero based, lines are 1 based */ } /* add the new list */ cut_lists = xrealloc_vector(cut_lists, 4, nlists); /* NB: startpos is always >= 0 */ cut_lists[nlists].startpos = s; cut_lists[nlists].endpos = e; nlists++; } /* make sure we got some cut positions out of all that */ if (nlists == 0) bb_simple_error_msg_and_die("missing list of positions"); /* now that the lists are parsed, we need to sort them to make life * easier on us when it comes time to print the chars / fields / lines */ if (!(opt & CUT_OPT_NOSORT_FLGS)) qsort(cut_lists, nlists, sizeof(cut_lists[0]), cmpfunc); } { exitcode_t retval = EXIT_SUCCESS; if (!*argv) *--argv = (char *)"-"; do { FILE *file = fopen_or_warn_stdin(*argv); if (!file) { retval = EXIT_FAILURE; continue; } cut_file(file, delim, odelim, cut_lists, nlists); fclose_if_not_stdin(file); } while (*++argv); if (ENABLE_FEATURE_CLEAN_UP) free(cut_lists); fflush_stdout_and_exit(retval); } }