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