570 lines
14 KiB
C
570 lines
14 KiB
C
/*
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* The information in this document is subject to change
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* without notice and should not be construed as a commitment
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* by Digital Equipment Corporation or by DECUS.
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*
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* Neither Digital Equipment Corporation, DECUS, nor the authors
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* assume any responsibility for the use or reliability of this
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* document or the described software.
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*
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* Copyright (C) 1980, DECUS
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*
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* General permission to copy or modify, but not for profit, is
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* hereby granted, provided that the above copyright notice is
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* included and reference made to the fact that reproduction
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* privileges were granted by DECUS.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <ctype.h> // tolower()
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/*
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* grep
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*
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* Runs on the Decus compiler or on vms, On vms, define as:
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* grep :== "$disk:[account]grep" (native)
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* grep :== "$disk:[account]grep grep" (Decus)
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* See below for more information.
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*/
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char *documentation[] = {
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"grep searches a file for a given pattern. Execute by",
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" grep [flags] regular_expression file_list\n",
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"Flags are single characters preceded by '-':",
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" -c Only a count of matching lines is printed",
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" -f Print file name for matching lines switch, see below",
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" -n Each line is preceded by its line number",
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" -v Only print non-matching lines\n",
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"The file_list is a list of files (wildcards are acceptable on RSX modes).",
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"\nThe file name is normally printed if there is a file given.",
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"The -f flag reverses this action (print name no file, not if more).\n",
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0 };
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char *patdoc[] = {
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"The regular_expression defines the pattern to search for. Upper- and",
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"lower-case are always ignored. Blank lines never match. The expression",
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"should be quoted to prevent file-name translation.",
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"x An ordinary character (not mentioned below) matches that character.",
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"'\\' The backslash quotes any character. \"\\$\" matches a dollar-sign.",
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"'^' A circumflex at the beginning of an expression matches the",
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" beginning of a line.",
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"'$' A dollar-sign at the end of an expression matches the end of a line.",
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"'.' A period matches any character except \"new-line\".",
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"':a' A colon matches a class of characters described by the following",
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"':d' character. \":a\" matches any alphabetic, \":d\" matches digits,",
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"':n' \":n\" matches alphanumerics, \": \" matches spaces, tabs, and",
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"': ' other control characters, such as new-line.",
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"'*' An expression followed by an asterisk matches zero or more",
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" occurrences of that expression: \"fo*\" matches \"f\", \"fo\"",
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" \"foo\", etc.",
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"'+' An expression followed by a plus sign matches one or more",
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" occurrences of that expression: \"fo+\" matches \"fo\", etc.",
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"'-' An expression followed by a minus sign optionally matches",
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" the expression.",
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"'[]' A string enclosed in square brackets matches any character in",
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" that string, but no others. If the first character in the",
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" string is a circumflex, the expression matches any character",
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" except \"new-line\" and the characters in the string. For",
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" example, \"[xyz]\" matches \"xx\" and \"zyx\", while \"[^xyz]\"",
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" matches \"abc\" but not \"axb\". A range of characters may be",
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" specified by two characters separated by \"-\". Note that,",
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" [a-z] matches alphabetics, while [z-a] never matches.",
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"The concatenation of regular expressions is a regular expression.",
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0};
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#define LMAX 512
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#define PMAX 256
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#define CHAR 1
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#define BOL 2
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#define EOL 3
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#define ANY 4
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#define CLASS 5
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#define NCLASS 6
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#define STAR 7
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#define PLUS 8
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#define MINUS 9
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#define ALPHA 10
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#define DIGIT 11
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#define NALPHA 12
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#define PUNCT 13
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#define RANGE 14
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#define ENDPAT 15
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int cflag=0, fflag=0, nflag=0, vflag=0, nfile=0, debug=0;
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char *pp, lbuf[LMAX], pbuf[PMAX];
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char *cclass();
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char *pmatch();
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void store(int);
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void error(char *);
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void badpat(char *, char *, char *);
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int match(void);
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/*** Display a file name *******************************/
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void file(char *s)
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{
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printf("File %s:\n", s);
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}
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/*** Report unopenable file ****************************/
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void cant(char *s)
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{
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fprintf(stderr, "%s: cannot open\n", s);
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}
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/*** Give good help ************************************/
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void help(char **hp)
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{
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char **dp;
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for (dp = hp; *dp; ++dp)
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printf("%s\n", *dp);
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}
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/*** Display usage summary *****************************/
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void usage(char *s)
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{
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fprintf(stderr, "?GREP-E-%s\n", s);
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fprintf(stderr,
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"Usage: grep [-cfnv] pattern [file ...]. grep ? for help\n");
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exit(1);
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}
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/*** Compile the pattern into global pbuf[] ************/
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void compile(char *source)
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{
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char *s; /* Source string pointer */
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char *lp; /* Last pattern pointer */
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int c; /* Current character */
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int o; /* Temp */
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char *spp; /* Save beginning of pattern */
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s = source;
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if (debug)
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printf("Pattern = \"%s\"\n", s);
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pp = pbuf;
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while (c = *s++) {
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/*
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* STAR, PLUS and MINUS are special.
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*/
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if (c == '*' || c == '+' || c == '-') {
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if (pp == pbuf ||
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(o=pp[-1]) == BOL ||
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o == EOL ||
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o == STAR ||
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o == PLUS ||
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o == MINUS)
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badpat("Illegal occurrence op.", source, s);
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store(ENDPAT);
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store(ENDPAT);
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spp = pp; /* Save pattern end */
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while (--pp > lp) /* Move pattern down */
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*pp = pp[-1]; /* one byte */
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*pp = (c == '*') ? STAR :
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(c == '-') ? MINUS : PLUS;
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pp = spp; /* Restore pattern end */
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continue;
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}
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/*
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* All the rest.
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*/
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lp = pp; /* Remember start */
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switch(c) {
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case '^':
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store(BOL);
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break;
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case '$':
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store(EOL);
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break;
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case '.':
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store(ANY);
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break;
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case '[':
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s = cclass(source, s);
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break;
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case ':':
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if (*s) {
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switch(tolower(c = *s++)) {
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case 'a':
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case 'A':
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store(ALPHA);
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break;
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case 'd':
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case 'D':
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store(DIGIT);
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break;
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case 'n':
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case 'N':
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store(NALPHA);
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break;
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case ' ':
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store(PUNCT);
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break;
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default:
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badpat("Unknown : type", source, s);
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}
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break;
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}
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else badpat("No : type", source, s);
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case '\\':
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if (*s)
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c = *s++;
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default:
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store(CHAR);
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store(tolower(c));
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}
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}
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store(ENDPAT);
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store(0); /* Terminate string */
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if (debug) {
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for (lp = pbuf; lp < pp;) {
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if ((c = (*lp++ & 0377)) < ' ')
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printf("\\%o ", c);
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else printf("%c ", c);
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}
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printf("\n");
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}
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}
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/*** Compile a class (within []) ***********************/
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char *cclass(char *source, char *src)
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/* char *source; // Pattern start -- for error msg. */
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/* char *src; // Class start */
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{
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char *s; /* Source pointer */
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char *cp; /* Pattern start */
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int c; /* Current character */
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int o; /* Temp */
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s = src;
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o = CLASS;
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if (*s == '^') {
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++s;
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o = NCLASS;
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}
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store(o);
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cp = pp;
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store(0); /* Byte count */
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while ((c = *s++) && c!=']') {
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if (c == '\\') { /* Store quoted char */
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if ((c = *s++) == '\0') /* Gotta get something */
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badpat("Class terminates badly", source, s);
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else store(tolower(c));
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}
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else if (c == '-' &&
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(pp - cp) > 1 && *s != ']' && *s != '\0') {
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c = pp[-1]; /* Range start */
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pp[-1] = RANGE; /* Range signal */
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store(c); /* Re-store start */
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c = *s++; /* Get end char and*/
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store(tolower(c)); /* Store it */
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}
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else {
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store(tolower(c)); /* Store normal char */
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}
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}
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if (c != ']')
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badpat("Unterminated class", source, s);
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if ((c = (pp - cp)) >= 256)
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badpat("Class too large", source, s);
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if (c == 0)
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badpat("Empty class", source, s);
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*cp = c;
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return(s);
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}
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/*** Store an entry in the pattern buffer **************/
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void store(int op)
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{
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if (pp >= &pbuf[PMAX])
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error("Pattern too complex\n");
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*pp++ = op;
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}
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/*** Report a bad pattern specification ****************/
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void badpat(char *message, char *source, char *stop)
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/* char *message; // Error message */
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/* char *source; // Pattern start */
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/* char *stop; // Pattern end */
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{
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fprintf(stderr, "-GREP-E-%s, pattern is\"%s\"\n", message, source);
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fprintf(stderr, "-GREP-E-Stopped at byte %ld, '%c'\n",
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stop-source, stop[-1]);
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error("?GREP-E-Bad pattern\n");
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}
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/*** Scan the file for the pattern in pbuf[] ***********/
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void grep(FILE *fp, char *fn)
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/* FILE *fp; // File to process */
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/* char *fn; // File name (for -f option) */
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{
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int lno, count, m;
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lno = 0;
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count = 0;
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while (fgets(lbuf, LMAX, fp)) {
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++lno;
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m = match();
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if ((m && !vflag) || (!m && vflag)) {
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++count;
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if (!cflag) {
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if (fflag && fn) {
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file(fn);
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fn = 0;
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}
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if (nflag)
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printf("%d\t", lno);
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printf("%s\n", lbuf);
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}
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}
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}
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if (cflag) {
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if (fflag && fn)
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file(fn);
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printf("%d\n", count);
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}
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}
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/*** Match line (lbuf) with pattern (pbuf) return 1 if match ***/
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int match()
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{
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char *l; /* Line pointer */
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for (l = lbuf; *l; ++l) {
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if (pmatch(l, pbuf))
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return(1);
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}
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return(0);
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}
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/*** Match partial line with pattern *******************/
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char *pmatch(char *line, char *pattern)
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/* char *line; // (partial) line to match */
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/* char *pattern; // (partial) pattern to match */
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{
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char *l; /* Current line pointer */
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char *p; /* Current pattern pointer */
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char c; /* Current character */
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char *e; /* End for STAR and PLUS match */
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int op; /* Pattern operation */
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int n; /* Class counter */
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char *are; /* Start of STAR match */
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l = line;
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if (debug > 1)
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printf("pmatch(\"%s\")\n", line);
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p = pattern;
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while ((op = *p++) != ENDPAT) {
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if (debug > 1)
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printf("byte[%ld] = 0%o, '%c', op = 0%o\n",
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l-line, *l, *l, op);
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switch(op) {
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case CHAR:
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if (tolower(*l++) != *p++)
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return(0);
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break;
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case BOL:
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if (l != lbuf)
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return(0);
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break;
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case EOL:
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if (*l != '\0')
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return(0);
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break;
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case ANY:
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if (*l++ == '\0')
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return(0);
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break;
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case DIGIT:
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if ((c = *l++) < '0' || (c > '9'))
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return(0);
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break;
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case ALPHA:
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c = tolower(*l++);
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if (c < 'a' || c > 'z')
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return(0);
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break;
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case NALPHA:
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c = tolower(*l++);
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if (c >= 'a' && c <= 'z')
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break;
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else if (c < '0' || c > '9')
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return(0);
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break;
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case PUNCT:
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c = *l++;
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if (c == 0 || c > ' ')
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return(0);
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break;
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case CLASS:
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case NCLASS:
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c = tolower(*l++);
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n = *p++ & 0377;
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do {
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if (*p == RANGE) {
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p += 3;
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n -= 2;
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if (c >= p[-2] && c <= p[-1])
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break;
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}
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else if (c == *p++)
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break;
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} while (--n > 1);
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if ((op == CLASS) == (n <= 1))
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return(0);
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if (op == CLASS)
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p += n - 2;
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break;
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case MINUS:
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e = pmatch(l, p); /* Look for a match */
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while (*p++ != ENDPAT); /* Skip over pattern */
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if (e) /* Got a match? */
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l = e; /* Yes, update string */
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break; /* Always succeeds */
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case PLUS: /* One or more ... */
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if ((l = pmatch(l, p)) == 0)
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return(0); /* Gotta have a match */
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case STAR: /* Zero or more ... */
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are = l; /* Remember line start */
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while (*l && (e = pmatch(l, p)))
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l = e; /* Get longest match */
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while (*p++ != ENDPAT); /* Skip over pattern */
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while (l >= are) { /* Try to match rest */
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if (e = pmatch(l, p))
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return(e);
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--l; /* Nope, try earlier */
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}
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return(0); /* Nothing else worked */
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default:
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printf("Bad op code %d\n", op);
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error("Cannot happen -- match\n");
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}
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}
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return(l);
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}
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/*** Report an error ***********************************/
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void error(char *s)
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{
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fprintf(stderr, "%s", s);
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exit(1);
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}
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/*** Main program - parse arguments & grep *************/
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int main(int argc, char **argv)
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{
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char *p;
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int c, i;
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int gotpattern;
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FILE *f;
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if (argc <= 1)
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usage("No arguments");
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if (argc == 2 && argv[1][0] == '?' && argv[1][1] == 0) {
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help(documentation);
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help(patdoc);
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return 0;
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}
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nfile = argc-1;
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gotpattern = 0;
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for (i=1; i < argc; ++i) {
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p = argv[i];
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if (*p == '-') {
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++p;
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while (c = *p++) {
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switch(tolower(c)) {
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case '?':
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help(documentation);
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break;
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case 'C':
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case 'c':
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++cflag;
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break;
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case 'D':
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case 'd':
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++debug;
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break;
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case 'F':
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case 'f':
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++fflag;
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break;
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case 'n':
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case 'N':
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++nflag;
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break;
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case 'v':
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case 'V':
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++vflag;
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break;
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default:
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usage("Unknown flag");
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}
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}
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argv[i] = 0;
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--nfile;
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} else if (!gotpattern) {
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compile(p);
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argv[i] = 0;
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++gotpattern;
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--nfile;
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}
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}
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if (!gotpattern)
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usage("No pattern");
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if (nfile == 0)
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// grep(stdin, 0);
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;
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else {
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fflag = fflag ^ (nfile > 0);
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for (i=1; i < argc; ++i) {
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if (p = argv[i]) {
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if ((f=fopen(p, "r")) == NULL)
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cant(p);
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else {
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grep(f, p);
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fclose(f);
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}
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}
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}
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}
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return 0;
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}
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/* vim: set expandtab ts=4 sw=3 sts=3 tw=80 :*/
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