310 lines
7.5 KiB
C
310 lines
7.5 KiB
C
/* cut - extract columns from a file or stdin. Author: Michael J. Holme
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*
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* Copyright 1989, Michael John Holme, All rights reserved.
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* This code may be freely distributed, provided that this notice
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* remains intact.
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*
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* V1.1: 6th September 1989
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*
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* Bugs, criticisms, etc,
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* c/o Mark Powell
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* JANET sq79@uk.ac.liv
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* ARPA sq79%liv.ac.uk@nsfnet-relay.ac.uk
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* UUCP ...!mcvax!ukc!liv.ac.uk!sq79
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*-------------------------------------------------------------------------
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* Changed for POSIX1003.2/Draft10 conformance
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* Thomas Brupbacher (tobr@mw.lpc.ethz.ch), September 1990.
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* Changes:
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* - separation of error messages ( stderr) and output (stdout).
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* - support for -b and -n (no effect, -b acts as -c)
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* - support for -s
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*-------------------------------------------------------------------------
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*/
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#include <sys/types.h>
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#include <ctype.h>
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#include <string.h>
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#define MAX_FIELD 80 /* Pointers to the beginning of each field
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* are stored in columns[], if a line holds
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* more than MAX_FIELD columns the array
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* boundary is exceed. But unlikely at 80 */
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#define MAX_ARGS 32 /* Maximum number of fields following -f or
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* -c switches */
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int args[MAX_ARGS * 2];
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int num_args;
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/* Lots of new defines, should easen maintainance... */
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#define DUMP_STDIN 0 /* define for mode: no options */
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#define OPTIONF 1 /* define for mode: option -f */
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#define OPTIONC 2 /* define for mode: option -c */
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#define OPTIONB 3 /* define for mode: option -b */
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#define NOTSET 0 /* option not selected */
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#define SET 1 /* option selected */
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/* Defines for the warnings */
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#define DELIMITER_NOT_APPLICABLE 0
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#define OVERRIDING_PREVIOUS_MODE 1
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#define OPTION_NOT_APPLICABLE 2
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#define UNKNOWN_OPTION 3
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#define FILE_NOT_READABLE 4
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/* Defines for the fatal errors */
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#define SYNTAX_ERROR 101
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#define POSITION_ERROR 102
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#define USAGE 103
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#define LINE_TO_LONG_ERROR 104
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#define RANGE_ERROR 105
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#define MAX_FIELDS_EXEEDED_ERROR 106
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#define MAX_ARGS_EXEEDED_ERROR 107
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int mode; /* 0 = dump stdin to stdout, 1=-f, 2=-c */
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int flag_i; /* SET = -i set on command line */
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int flag_s; /* SET = -s set on command line */
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char delim = '\t'; /* default delimiting character */
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FILE *fd;
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char *name;
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char line[BUFSIZ];
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int exit_status;
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_PROTOTYPE(int main, (int argc, char **argv));
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_PROTOTYPE(void warn, (int warn_number, char *option));
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_PROTOTYPE(void cuterror, (int err));
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_PROTOTYPE(void get_args, (void));
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_PROTOTYPE(void cut, (void));
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void warn(warn_number, option)
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int warn_number;
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char *option;
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{
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static char *warn_msg[] = {
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"%s: Option -d allowed only with -f\n",
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"%s: -%s overrides earlier option\n",
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"%s: -%s not allowed in current mode\n",
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"%s: Cannot open %s\n"
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};
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fprintf(stderr, warn_msg[warn_number], name, option);
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exit_status = warn_number + 1;
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}
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void cuterror(err)
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int err;
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{
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static char *err_mes[] = {
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"%s: syntax error\n",
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"%s: position must be >0\n",
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"%s: usage: cut [-f args [-i] [-d x]]|[-c args] [filename [...]]\n",
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"%s: line longer than BUFSIZ\n",
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"%s: range must not decrease from left to right\n",
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"%s: MAX_FIELD exceeded\n",
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"%s: MAX_ARGS exceeded\n"
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};
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fprintf(stderr, err_mes[err - 101], name);
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exit(err);
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}
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void get_args()
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{
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int i = 0;
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int arg_ptr = 0;
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int flag;
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num_args = 0;
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do {
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if (num_args == MAX_ARGS) cuterror(MAX_ARGS_EXEEDED_ERROR);
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if (!isdigit(line[i]) && line[i] != '-') cuterror(SYNTAX_ERROR);
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args[arg_ptr] = 1;
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args[arg_ptr + 1] = BUFSIZ;
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flag = 1;
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while (line[i] != ',' && line[i] != 0) {
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if (isdigit(line[i])) {
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args[arg_ptr] = 0;
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while (isdigit(line[i]))
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args[arg_ptr] = 10 * args[arg_ptr] + line[i++] - '0';
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if (!args[arg_ptr]) cuterror(POSITION_ERROR);
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arg_ptr++;
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}
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if (line[i] == '-') {
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arg_ptr |= 1;
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i++;
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flag = 0;
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}
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}
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if (flag && arg_ptr & 1) args[arg_ptr] = args[arg_ptr - 1];
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if (args[num_args * 2] > args[num_args * 2 + 1])
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cuterror(RANGE_ERROR);
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num_args++;
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arg_ptr = num_args * 2;
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}
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while (line[i++]);
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}
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void cut()
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{
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int i, j, length, maxcol;
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char *columns[MAX_FIELD];
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while (fgets(line, BUFSIZ, fd)) {
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length = strlen(line) - 1;
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*(line + length) = 0;
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switch (mode) {
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case DUMP_STDIN: printf("%s", line); break;
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case OPTIONF:
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maxcol = 0;
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columns[maxcol++] = line;
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for (i = 0; i < length; i++) {
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if (*(line + i) == delim) {
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*(line + i) = 0;
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if (maxcol == MAX_FIELD)
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cuterror(MAX_FIELDS_EXEEDED_ERROR);
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columns[maxcol] = line + i + 1;
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while (*(line + i + 1) == delim && flag_i) {
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columns[maxcol]++;
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i++;
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}
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maxcol++;
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}
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}
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if (maxcol == 1) {
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if (flag_s != SET) printf("%s", line);
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} else {
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for (i = 0; i < num_args; i++) {
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for (j = args[i * 2]; j <= args[i * 2 + 1]; j++)
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if (j <= maxcol) {
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printf("%s", columns[j - 1]);
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if (i != num_args - 1 || j != args[i * 2 + 1])
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putchar(delim);
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}
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}
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}
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break;
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case OPTIONC:
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for (i = 0; i < num_args; i++) {
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for (j = args[i * 2]; j <= (args[i * 2 + 1] > length ? length :
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args[i * 2 + 1]); j++)
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putchar(*(line + j - 1));
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}
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}
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if (maxcol == 1 && flag_s == SET);
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else
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putchar('\n');
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}
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}
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int main(argc, argv)
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int argc;
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char *argv[];
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{
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int i = 1;
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int numberFilenames = 0;
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name = argv[0];
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if (argc == 1) cuterror(USAGE);
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while (i < argc) {
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if (argv[i][0] == '-') {
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switch (argv[i++][1]) {
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case 'd':
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if (mode == OPTIONC || mode == OPTIONB)
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warn(DELIMITER_NOT_APPLICABLE, "d");
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delim = argv[i++][0];
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break;
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case 'f':
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sprintf(line, "%s", argv[i++]);
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if (mode == OPTIONC || mode == OPTIONB)
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warn(OVERRIDING_PREVIOUS_MODE, "f");
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mode = OPTIONF;
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break;
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case 'b':
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sprintf(line, "%s", argv[i++]);
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if (mode == OPTIONF || mode == OPTIONC)
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warn(OVERRIDING_PREVIOUS_MODE, "b");
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mode = OPTIONB;
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break;
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case 'c':
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sprintf(line, "%s", argv[i++]);
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if (mode == OPTIONF || mode == OPTIONB)
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warn(OVERRIDING_PREVIOUS_MODE, "c");
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mode = OPTIONC;
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break;
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case 'i': flag_i = SET; break;
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case 's': flag_s = SET; break;
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case '\0': /* - means: read from stdin */
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numberFilenames++;
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break;
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case 'n': /* needed for Posix, but no effect here */
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if (mode != OPTIONB)
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warn(OPTION_NOT_APPLICABLE, "n");
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break;
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default:
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warn(UNKNOWN_OPTION, &(argv[i - 1][1]));
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}
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} else {
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i++;
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numberFilenames++;
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}
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}
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/* Here follow the checks, if the selected options are reasonable. */
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if (mode == OPTIONB) /* since in Minix char := byte */
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mode = OPTIONC;
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/* Flag -s is only allowed with -f, otherwise warn and reset flag_s */
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if (flag_s == SET && (mode == OPTIONB || mode == OPTIONC)) {
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warn(OPTION_NOT_APPLICABLE, "s");
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flag_s = NOTSET;
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}
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/* Flag -i is only allowed with -f, otherwise warn and reset flag_i */
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if (flag_i == SET && mode == OPTIONF) {
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warn(OPTION_NOT_APPLICABLE, "s");
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flag_i = NOTSET;
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}
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get_args();
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if (numberFilenames != 0) {
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i = 1;
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while (i < argc) {
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if (argv[i][0] == '-') {
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switch (argv[i][1]) {
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case 'f':
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case 'c':
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case 'b':
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case 'd': i += 2; break;
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case 'n':
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case 'i':
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case 's': i++; break;
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case '\0':
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fd = stdin;
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i++;
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cut();
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break;
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default: i++;
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}
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} else {
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if ((fd = fopen(argv[i++], "r")) == NULL) {
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warn(FILE_NOT_READABLE, argv[i - 1]);
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} else {
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cut();
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fclose(fd);
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}
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}
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}
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} else {
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fd = stdin;
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cut();
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}
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return(exit_status);
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}
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