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Atari Mega Archive 1
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Atari Mega Archive - Volume 1.iso
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mint
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utils
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agrepsrc.zoo
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preproce.c
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C/C++ Source or Header
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1993-01-19
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8KB
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216 lines
/* Copyright (c) 1991 Sun Wu and Udi Manber. All Rights Reserved. */
/* substitute metachar with special symbol */
/* if regularr expression, then set flag REGEX */
/* if REGEX and MULTIPAT then report error message, */
/* -w only for single word pattern. If WORDBOUND & MULTIWORD error */
/* process start of line, endof line symbol, */
/* process -w WORDBOUND option, append special symbol at begin&end of */
/* process -d option before this routine */
/* the delimiter pattern is in D_pattern (need to end with '; ') */
/* if '-t' (suggestion: how about -B) the pattern is passed to sgrep */
/* and doesn't go here */
/* in that case, -d is ignored? or not necessary */
/* upon return, Pattern contains the pattern to be processed by maskgen */
/* D_pattern contains transformed D_pattern */
#include "agrep.h"
extern int SIMPLEPATTERN, WHOLELINE, REGEX, RE_ERR, DELIMITER, TAIL, WORDBOUND;
extern int HEAD;
extern CHAR Progname[];
extern int D_length;
extern int table[WORD][WORD];
preprocess(D_pattern, Pattern) /* need two parameters */
CHAR *D_pattern, *Pattern;
{
CHAR temp[Maxline], *r_pat, *old_pat; /* r_pat for r.e. */
CHAR old_D_pat[MaxDelimit];
int i, j=0, rp=0, m, t=0, partitions, num_pos, ANDON = 0;
int d_end ;
int IN_RANGE=0, EVEN=0, OR_AND=0;
old_pat = Pattern; /* to remember the starting position */
m = strlen(Pattern);
for(i=0; i< m; i++) {
if(Pattern[i] == '\\') i++;
else if(Pattern[i] == '|' || Pattern[i] == '*' ) REGEX = ON;
}
r_pat = (CHAR *) malloc(strlen(Pattern)+2*strlen(D_pattern));
strcpy(temp, D_pattern);
d_end = t = strlen(temp); /* size of D_pattern, including '; ' */
if (WHOLELINE) { temp[t++] = LANGLE;
temp[t++] = NNLINE;
temp[t++] = RANGLE;
temp[t] = '\0';
strcat(temp, Pattern);
m = strlen(temp);
temp[m++] = LANGLE;
temp[m++] = '\n';
temp[m++] = RANGLE;
temp[m] = '\0'; }
else {
if (WORDBOUND) { temp[t++] = LANGLE;
temp[t++] = WORDB;
temp[t++] = RANGLE;
temp[t] = '\0'; }
strcat(temp, Pattern);
m = strlen(temp);
if (WORDBOUND) { temp[m++] = LANGLE;
temp[m++] = WORDB;
temp[m++] = RANGLE; }
temp[m] = '\0';
}
/* now temp contains augmented pattern , m it's size */
D_length = 0;
for (i=0, j=0; i< d_end-2; i++) {
switch(temp[i])
{
case '\\' : i++;
Pattern[j++] = temp[i];
old_D_pat[D_length++] = temp[i];
break;
case '<' : Pattern[j++] = LANGLE;
break;
case '>' : Pattern[j++] = RANGLE;
break;
case '^' : Pattern[j++] = '\n';
old_D_pat[D_length++] = temp[i];
break;
case '$' : Pattern[j++] = '\n';
old_D_pat[D_length++] = temp[i];
break;
default : Pattern[j++] = temp[i];
old_D_pat[D_length++] = temp[i];
break;
}
}
if(D_length > MAXDELIM) {
fprintf(stderr, "%s: delimiter pattern too long\n", Progname);
exit(2);
}
Pattern[j++] = ANDPAT;
old_D_pat[D_length] = '\0';
strcpy(D_pattern, old_D_pat);
D_length++;
/*
Pattern[j++] = ' ';
*/
Pattern[j] = '\0';
rp = 0;
if(REGEX) {
r_pat[rp++] = '.'; /* if REGEX: always append '.' in front */
r_pat[rp++] = '(';
Pattern[j++] = NOCARE;
HEAD = ON;
}
for (i=d_end; i < m ; i++)
{
switch(temp[i])
{
case '\\': i++; Pattern[j++] = temp[i];
r_pat[rp++] = 'o'; /* the symbol doesn't matter */
break;
case '#': if(REGEX) {
Pattern[j++] = NOCARE;
r_pat[rp++] = '.';
r_pat[rp++] = '*';
break; }
Pattern[j++] = WILDCD;
break;
case '(': Pattern[j++] = LPARENT;
r_pat[rp++] = '(';
break;
case ')': Pattern[j++] = RPARENT;
r_pat[rp++] = ')';
break;
case '[': Pattern[j++] = LRANGE;
r_pat[rp++] = '[';
IN_RANGE = ON;
break;
case ']': Pattern[j++] = RRANGE;
r_pat[rp++] = ']';
IN_RANGE = OFF;
break;
case '<': Pattern[j++] = LANGLE;
break;
case '>': Pattern[j++] = RANGLE;
break;
case '^': if (temp[i-1] == '[') Pattern[j++] = NOTSYM;
else Pattern[j++] = '\n';
r_pat[rp++] = '^';
break;
case '$': Pattern[j++] = '\n';
r_pat[rp++] = '$';
break;
case '.': Pattern[j++] = NOCARE;
r_pat[rp++] = '.';
break;
case '*': Pattern[j++] = STAR;
r_pat[rp++] = '*';
break;
case '|': Pattern[j++] = ORSYM;
r_pat[rp++] = '|';
break;
case ',': Pattern[j++] = ORPAT;
RE_ERR = ON;
break;
case ';': if(ANDON) RE_ERR = ON;
Pattern[j++] = ANDPAT;
ANDON = ON;
break;
case '-': if(IN_RANGE) {
Pattern[j++] = HYPHEN;
r_pat[rp++] = '-';
}
else {
Pattern[j++] = temp[i];
r_pat[rp++] = temp[i];
}
break;
case NNLINE :
Pattern[j++] = temp[i];
r_pat[rp++] = 'N';
break;
default: Pattern[j++] = temp[i];
r_pat[rp++] = temp[i];
break;
}
}
if(REGEX) { /* append ').' at end of regular expression */
r_pat[rp++] = ')';
r_pat[rp++] = '.';
Pattern[j++] = NOCARE;
TAIL = ON;
}
Pattern[j] = '\0';
m = j;
r_pat[rp] = '\0';
if(REGEX)
{
if(DELIMITER || WORDBOUND) {
fprintf(stderr, "%s: -d or -w option is not supported for this pattern\n", Progname);
exit(2);
}
if(RE_ERR) {
fprintf(stderr, "%s: illegal regular expression\n", Progname);
exit(2);
}
while(*Pattern != NOCARE && m-- > 0) Pattern++; /* poit to . */
num_pos = init(r_pat, table);
if(num_pos <= 0) {
fprintf(stderr, "%s: illegal regular expression\n", Progname);
exit(2);
}
if(num_pos > 30) {
fprintf(stderr, "%s: regular expression too long\n", Progname);
exit(2);
}
strcpy(old_pat, Pattern); /* do real change to the Pattern to be returned */
return;
} /* if regex */
return;
}