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#define version "patc v1.1c (c) Jeroen Hellingman 01-MAY-1993\n"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include "PSTree.h"
#define TRUE (1==1)
#define FALSE (1==0)
#define NUMPATS 10 /* number of pattern trees */
#define PATLEN 50 /* maximum length of pattern */
#define BUFSIZE 512 /* pushback buffer size (BUFSIZE >= PATLEN) */
/* datatypen */
typedef struct patterntree
{ PSTree *t; /* pattern tree for this node */
int r; /* restrictive or not? */
} patterntree;
/* globals */
FILE *infile;
FILE *outfile;
patterntree pat[NUMPATS];
char *progname = "patc";
char *patfilename = "patc.pat";
char *infilename;
char *outfilename;
static int quiet = TRUE; /* be quiet */
static int linenumber = 1; /* current line in infile */
/* prototypes */
void parsetables(FILE *patfile);
void patc(void);
void processflags(int argc, char** argv);
void usage(void);
void copytexcommand(void);
void skiptexcommand(void);
void skiptillmatchingbrace(void);
void skiptillchar(char c1);
void copycomment(void);
void skipcomment(void);
int readchar(void);
void unreadchar(int);
int what_escape(const char *s, char *result);
/***********************************************************************/
void PUSHBACK(char *c)
/* push the characters in string c back into the inputstream, works
* with the pair of functions readchar() and unreadchar()
*/
{ int i = (int)strlen(c)-1;
for( ;i >= 0; i--) unreadchar((int)c[i]);
}
void main(int argc, char** argv)
/* check arguments, intialize tables, open files
*/
{ FILE *patfile;
processflags(argc, argv);
if(!quiet) fputs(version, stderr);
patfile = fopen(patfilename, "r");
if(patfile==NULL)
{ fprintf(stderr, "%s: can't open %s\n", progname, patfilename);
exit(2);
}
parsetables(patfile);
fclose(patfile);
infile = fopen(infilename, "r");
if(infile==NULL)
{ fprintf(stderr, "%s: can't open %s\n", progname, infilename);
exit(2);
}
outfile = fopen(outfilename, "w");
if(outfile==NULL)
{ fprintf(stderr, "%s: can't create %s\n", progname, outfilename);
exit(2);
}
patc();
fclose(infile);
fclose(outfile);
exit(0);
}
void processflags(int argc, char** argv)
{ int nextoption = FALSE;
int i = 1;
if(argc < i+2) usage();
if(argv[i][0] == '-') nextoption = TRUE;
while(nextoption)
{ switch(argv[i][1])
{ case 'v': quiet = FALSE; break;
case 'p': patfilename = argv[i+1]; i++; break;
default: usage();
}
i++;
if(argc < i+2) usage();
if(argv[i][0] != '-') nextoption = FALSE;
}
infilename = argv[i];
outfilename = argv[i+1];
}
void usage()
{ fprintf(stderr, "usage: %s [-v] [-p patfile] infile outfile\n", progname);
exit(1);
}
/***********************************************************************/
int readline(char *l, FILE* infile)
{ int i = 0;
int c = fgetc(infile);
while(isspace(c) && c != '\n' && c != EOF) c = fgetc(infile); /* skip whitespace */
if(c == '%') while(c != '\n' && c != EOF) c = fgetc(infile); /* skip comments */
while(c != '\n' && c != EOF && i < BUFSIZE)
{ l[i] = (c == EOF) ? '\0' : (int) c;
i++;
c = getc(infile);
}
l[i] = '\0'; /* NULL-terminate */
return (c!=EOF);
}
int getword(char *s, char *d)
{ int i = 0, j = 0;
while(isspace(s[i]) && s[i] != '\0') i++;
while(isalnum(s[i])) { d[j] = s[i]; j++; i++; }
d[j] = '\0';
return i;
}
int getquotedstring(const char *s, char *d)
{ int i = 0; /* no of chars read in source */
int j = 0; /* no of chars inserted in destination */
while(isspace(s[i]) && s[i] != '\0') i++;
if(s[i] == '"')
{ i++;
while(s[i] != '"')
{ if(s[i] == '\\') /* escape char */
i += what_escape(&s[i], &d[j]);
else
{ d[j] = s[i];
}
j++; i++;
}
}
d[j] = '\0'; /* NULL-terminate */
i++; /* skip final " */
return i;
}
/* Find out what escape sequence is used. If non can be found, we just
forget about the backslash. Interprete numbers up to 255/177/FF
*/
#define UNSIGNED(t) (char)(((t) < 0) ? (t) + 256 : (t))
int what_escape(const char *s, char *result)
{ int i = 1; /* length of escape sequence read */
int ok = TRUE;
int t = 0; /* temporary result */
switch(s[1])
{ case '"': *result = '"'; break;
case '\\': *result = '\\'; break;
case 't': *result = '\t'; break;
case 'n': *result = '\n'; break;
case 'b': *result = '\b'; break;
case 'h': /* hexadecimal */
while(i < 3 && ok)
{ i++;
if(s[i]>='0' && s[i]<='9') t = t * 16 + (s[i] - '0');
else if(s[i]>='A' && s[i]<='F') t = t * 16 + (s[i] - 'A') + 10;
else if(s[i]>='a' && s[i]<='f') t = t * 16 + (s[i] - 'a') + 10;
else
{ if(i==2) /* no number after \h */
*result = 'h';
else /* short number after \h */
*result = UNSIGNED(t);
i--;
ok = FALSE;
}
}
if(ok) *result = UNSIGNED(t);
break;
case 'd': /* decimal */
while(i < 4 && ok)
{ i++;
if(s[i]>='0' && s[i]<='9') t = t * 10 + (s[i] - '0');
else
{ if(i==2) /* no number after \d */
*result = 'd';
else /* short number after \d */
*result = UNSIGNED(t);
i--;
ok = FALSE;
}
}
if(ok) *result = UNSIGNED(t);
break;
default: /* try octal interpretation */
i--;
while(i < 3 && ok)
{ i++;
if(s[i]>='0' && s[i]<='7') t = t * 8 + (s[i] - '0');
else
{ if(i==1) /* no number after \ */
*result = s[i];
else /* short number after \ */
{ *result = UNSIGNED(t);
i--;
}
ok = FALSE;
}
}
if(ok) *result = UNSIGNED(t);
}
return i;
}
void parsetables(FILE *patfile)
{ char line[BUFSIZE];
char command[BUFSIZE];
char pattern[BUFSIZE];
char action[BUFSIZE];
char *tmp;
int pos = 1;
char notEOF = TRUE;
int currentpat = 0; /* current patterntree under construction */
while(notEOF)
{ notEOF = readline(line, patfile);
pos = 0;
switch(line[0])
{ case '\0': /* empty line */ break;
case '@': /* command */
pos++;
pos += tolower(getword(&line[1], command));
if(strcmp(command, "patterns") == 0)
{ pos += getword(&line[pos], command);
currentpat = atoi(command);
pat[currentpat].r = FALSE;
}
else if(strcmp(command, "rpatterns") == 0)
{ pos += getword(&line[pos], command);
currentpat = atoi(command);
pat[currentpat].r = TRUE;
}
else if(strcmp(command, "end") == 0) return;
else
{ fprintf(stderr, "Error: unknown command %s\n", command);
exit(1);
}
break;
case '"': /* action */
pos += getquotedstring(line, pattern);
pos += getword(&line[pos], command);
pos += getquotedstring(&line[pos], &action[1]);
action[0] = command[0];
tmp = malloc(strlen(action) + 1);
if(tmp == NULL)
{ fprintf(stderr, "Error: cannot allocate\n");
exit(3);
}
strcpy(tmp, action);
PSTinsert(&pat[currentpat].t, pattern, tmp);
break;
default: fprintf(stderr, "Error: illegal line '%s' in %s\n",
line, patfilename);
fprintf(stderr, "I will forget it\n");
}
}
}
/***********************************************************************/
void patc()
{ char ps[PATLEN+1]; /* pattern to be search for */
char *action; /* action with pattern */
int len = PATLEN; /* length of found pattern; part of ps to be read */
int current = 0; /* current active patterntree */
int i, j; /* counters */
while(TRUE)
{
/* fill pattern */
for(i = 0, j = len; j < PATLEN; i++, j++) ps[i] = ps[j];
for(i = PATLEN - len; i < PATLEN; i++)
{ int c = readchar();
ps[i] = (c == EOF) ? '\0' : c;
}
ps[PATLEN] = '\0'; /* NULL-terminate */
if(ps[0] == '\0') break;
/* find action */
action = PSTmatch(pat[current].t, ps, &len);
if(len == 0)
{ if(pat[current].r) /* complain */
fprintf(stderr, "Error: illegal character '%c' near line %d\n", ps[0], linenumber);
else /* copy silently */
fputc(ps[0], outfile);
len = 1;
}
else /* do action */
{ switch(action[0])
{ case 'p': fputs(&action[1], outfile); break;
case 'c': PUSHBACK(ps); len = PATLEN; copycomment(); break;
case 't': PUSHBACK(ps); len = PATLEN; copytexcommand(); break;
case 'T': PUSHBACK(ps); len = PATLEN; skiptexcommand(); break;
case 's': PUSHBACK(ps); len = PATLEN; skipcomment(); break;
case 'f': /* forget */ break;
case 'e': fprintf(stderr, "Error: %s near line %d\n", &action[1], linenumber);
break;
case 'S': PUSHBACK(ps); len = PATLEN; skiptillchar(action[1]); break;
case 'B': PUSHBACK(ps); len = PATLEN; skiptillmatchingbrace(); break;
case '0': current = 0; fputs(&action[1], outfile); break;
case '1': current = 1; fputs(&action[1], outfile); break;
case '2': current = 2; fputs(&action[1], outfile); break;
case '3': current = 3; fputs(&action[1], outfile); break;
case '4': current = 4; fputs(&action[1], outfile); break;
case '5': current = 5; fputs(&action[1], outfile); break;
case '6': current = 6; fputs(&action[1], outfile); break;
case '7': current = 7; fputs(&action[1], outfile); break;
case '8': current = 8; fputs(&action[1], outfile); break;
case '9': current = 9; fputs(&action[1], outfile); break;
default: fprintf(stderr, "Internal error: unknown action\n");
exit(10);
} /* switch */
} /* else */
} /* while */
if(current != 0)
fprintf(stderr, "Warning: mode = %d at end of file\n", current);
} /* patc() */
/***********************************************************************/
void skiptillchar(char c1)
{ char c2;
do
{ c2 = readchar();
if(c2 == EOF) return;
} while(c2 != c1);
}
void skiptillmatchingbrace()
/* skip a TeX group enclosed in braces.
* next brace on input opens the group to skip
*/
{ int i = 1;
int c;
do
{ c = readchar();
if(c == EOF) return;
} while(c != '{');
while(i>0)
{ c = readchar();
if(c == '{') i++;
if(c == '}') i--;
if(c == EOF) return;
}
}
void copytexcommand()
/* copy TeX commmand, including preceding \
* this will work in plain TeX and LaTeX
*/
{ int c = readchar();
if(c=='\\')
{ fputc(c, outfile);
c = readchar();
if(isalpha(c))
{ while(isalpha(c))
{ fputc(c, outfile);
c = readchar();
}
unreadchar(c);
}
else
fputc(c, outfile);
}
else
unreadchar(c);
}
void skiptexcommand()
/* skip TeX commmand, including preceding \
* this will work in plain TeX and LaTeX
*/
{ int c = readchar();
if(c=='\\')
{ c = readchar();
if(isalpha(c))
{ while(isalpha(c))
{ c = readchar();
}
unreadchar(c);
}
}
else
unreadchar(c);
}
void copycomment()
{ int c = readchar();
if(c=='%')
{ while(c != '\n' && c != EOF)
{ fputc(c, outfile);
c = readchar();
}
fputc('\n', outfile);
}
else
unreadchar(c);
}
void skipcomment()
{ int c = readchar();
if(c=='%')
{ while(c != '\n' && c != EOF)
c = readchar();
}
else
unreadchar(c);
}
/***********************************************************************/
/* file access with buffer */
static int fbuffer[BUFSIZE]; /* buffer for file operations */
static int last = 0; /* last + 1 used in fbuffer */
int readchar()
{ int result;
if(last==0) /* niets in buffer */
result = fgetc(infile);
else /* pak first uit buffer */
{ last--;
result = fbuffer[last];
}
if(result == '\n') linenumber++;
return result;
}
void unreadchar(int c)
{
if(last == BUFSIZE)
{ fprintf(stderr, "%s: push-back file buffer full\n", progname);
exit(1);
}
else /* voeg na last in buffer */
{ fbuffer[last] = c;
last++;
if(c == '\n') linenumber--;
}
}
/***********************************************************************/
|