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Simtel MSDOS 1992 September
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c_check.arc
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CCHECK.C
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1985-06-23
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758 lines
/*
* CCHECK.C -- Aztec C Version of CCHK, 06/23/85
*
*
* Copyright: The Regents of the University of California
* [Note - since Steve Draper distributed cchk.c over
* Usenet, I assume it's effectively in the public
* domain. JCM]
*
* Title: ccheck
*
* Purpose: To find and report all badly matched openers and
* closers plus assignment/equality confusions
* in a c source file.
*
* Author: Steve Draper, expanding cnest by Tom Anderson
*
* Usage: ccheck [-q] [-v] <filename1> <filename2> ...
*
* History (in reverse order to minimize reading time for updates):
*
* June 18, 1985 Converted to Aztec C - removed BDS C code - Rick Moore
*
* January 9, 1983 Single BDS/UNIX source created
* as CCHECK.C -- Jeff Martin
*
* December 29, 1982 Adapted for BDS C --
* Jeff Martin at home.
*
* December 20, 1982 Converted to cchk --
* Steve Draper at UCSD
*
* December 9, 1982 Jeffrey Mogul at Stanford
* - checks for unclosed comment at end of file.
*
* December 3, 1982 creation date --
* Tom Anderson at microsof!fluke
*/
#include <stdio.h>
#include <ctype.h>
#define TRUE 1
#define FALSE 0
#define SPACE 32
#define BRACE 1
#define SQBRAK 2
#define PAREN 3
#define IF 4
#define IFCOND 5
#define WHLCOND 6
#define THEN 7
#define ELSE 8
#define STACKSIZ 64
struct brak {
int type, b_indent, b_ln;
} stack[STACKSIZ];
#define rmbrak(N) (top -= N, stackc -= N)
#define myungetc(C) ungetc(((C) == '\n' ? SPACE : (C)), infile)
#define VFLAG "-v"
#define QFLAG "-q"
#define SFLAG "-s"
int firsttime; /* This was a static in mygetchar() */
int mygetchar(), pr();
void checkelse(), newbrak(), checkcloser(), prtype();
FILE *infile;
int ln, indent, commindent, stackc, commln;
int singlequoterr, oddsinglequote, bracecnt, parencnt, sqbrakcnt;
int errstatus, wstatus;
int errnmb, wnmb;
int verbose;
char *filename;
struct brak *top;
main(argc, argv)
unsigned argc ;
char *argv[] ;
{
register int c ;
int i;
int doubleqflag;
unsigned file_index;
wnmb = 0;
verbose = 0;
file_index = 1;
while (argc > 1 && argv[file_index][0] == '-') {
if (strcmp(argv[file_index], VFLAG) == 0)
verbose++;
if (strcmp(argv[file_index], QFLAG) == 0)
wnmb = -2;
if (strcmp(argv[file_index], SFLAG) == 0)
wnmb = -2;
file_index++;
argc--;
}
do {
/* INIT for each file */
firsttime = 1;
doubleqflag = 0;
errstatus = wstatus = 0;
ln = 1;
indent = 0;
commindent = 0;
singlequoterr = oddsinglequote = parencnt = sqbrakcnt = bracecnt =
0;
errnmb = 0;
if (wnmb > -2)
wnmb = 0;
newbrak(0);
if (argc == 1) {
infile = stdin;
filename = NULL;
} else {
if ((infile = fopen(argv[file_index], "r")) == (FILE * ) NULL) {
fprintf (stdout, "%s: Can't access %s\n", argv[0], argv[file_ind
continue;
}
filename = argv[file_index];
}
while ( ( c = mygetchar()) != EOF ) {
if (verbose == 2) {
for (i = stackc; i > 0; i--) {
printf("%c %d: type ", c, i);
prtype(stack[i].type);
printf(", indent %d, line %d.\n", stack[i].b_indent, stack[i
}
}
switch (c) {
case ';':
ungetc(SPACE, infile);
while (top->type == ELSE)
rmbrak(1);
if (top->type == THEN) {
rmbrak(1);
checkelse();
}
break;
case '!':
case '>':
case '<':
/* swallow legit. '=' chars */
c = mygetchar();
if (c != '=')
myungetc(c);
break;
case '=':
if ((top - 1)->type == IFCOND || (top - 1)->type == WHLCOND) {
c = mygetchar();
if (c != '=') {
myungetc(c);
if (pr(1))
printf("Assignment instead of equals in conditional,
ln);
}
}
break;
case '\n':
case SPACE:
c = mygetchar();
switch (c) {
case 'i':
/* if */
c = mygetchar();
if (c == 'f'
&& !isalpha(c = fgetc(infile)) && !isdigit(c)) {
ungetc(c, infile);
newbrak(IF);
while ((c = mygetchar()) == SPACE || c == '\n')
;
if (c != '(') {
if (pr(1))
printf("Bad if (no condition) line %d.\n",
ln);
rmbrak(1);
} else
newbrak(IFCOND);
myungetc(c);
} else
myungetc(c);
break;
case 'w':
/* while */
if ((c = mygetchar()) == 'h'
&& (c = mygetchar()) == 'i'
&& (c = mygetchar()) == 'l'
&& (c = mygetchar()) == 'e'
&& !isalpha(c = fgetc(infile)) && !isdigit(c)) {
ungetc(c, infile);
while ((c = mygetchar()) == SPACE || c == '\n')
;
if (c != '(') {
if (pr(1))
printf("Bad while (no condition) line %d.\n",
ln);
} else
newbrak(WHLCOND);
myungetc(c);
} else
myungetc(c);
break;
case 'e':
/* else */
myungetc(c);
checkelse();
break;
default:
myungetc(c);
break;
}
break;
case '*':
/* close comment ? */
c = mygetchar();
if (c != '/') {
myungetc(c);
break;
}
if (pr(1))
printf
("Line %d: Comment close without open, indent %d\n",
ln, indent);
break;
case '\'':
if ((c = fgetc(infile)) != '\\') {
if (c == '\'' || (c = fgetc(infile)) != '\'') {
if (pr(1))
printf("Bad character constant line %d\n", ln);
singlequoterr = 1;
}
} else if (!isdigit(c = fgetc(infile))) {
if ((c = fgetc(infile)) != '\'') {
if (pr(1))
printf("Bad character constant with \\ line %d\n",
ln);
}
} else {
if (isdigit(c = fgetc(infile)))
if (isdigit(c = fgetc(infile)))
c = fgetc(infile);
if (c != '\'')
if (pr(1))
printf("Bad character constant with \\0 line %d\n",
ln);
}
if (c != '\'') {
ungetc(c, infile);
oddsinglequote = !oddsinglequote;
singlequoterr = 1;
}
break;
case '"':
do {
c = fgetc(infile);
if (c == EOF) {
if (pr(2))
printf("Error: '\"' quoted string not ended by end o
break;
} else if (c == '\n') {
if (doubleqflag == 0)
if (pr(0))
printf("Warning: '\"' quoted string not ended by
ln);
doubleqflag = 1;
ln++;
} else if (c == '\\') {
c = SPACE;
fgetc(infile);
}
} while (c != '"');
doubleqflag = 0;
break;
case '{':
if (stackc && indent < top->b_indent)
if (pr(0))
printf("Indent jumps backwards line %d.\n", ln);
newbrak(BRACE);
break;
case '}':
checkcloser(BRACE);
while (top->type == ELSE)
rmbrak(1);
if (top->type == THEN) {
rmbrak(1);
checkelse();
}
break;
case '(':
if (stackc && indent < top->b_indent)
if (pr(0))
printf("Indent jumps backwards line %d.\n", ln);
newbrak(PAREN);
break;
case ')':
checkcloser(PAREN);
if (top->type == IFCOND) {
rmbrak(1);
newbrak(THEN);
} else if (top->type == WHLCOND)
rmbrak(1);
break;
case '[':
if (stackc && indent < top->b_indent)
if (pr(0))
printf("Indent jumps backwards line %d.\n", ln);
newbrak(SQBRAK);
break;
case ']':
checkcloser(SQBRAK);
break;
default:
break;
}
}
fclose(infile);
while (stackc > 0) {
pr(2);
fputs("Unclosed brak at EOF: ", stdout);
prtype(top->type);
printf(" opened on line %d.\n", top->b_ln);
switch (top->type) {
case BRACE:
bracecnt++;
break;
case SQBRAK:
sqbrakcnt++;
break;
case PAREN:
parencnt++;
break;
default:
break;
}
rmbrak(1);
}
if ((i = (oddsinglequote || bracecnt || sqbrakcnt || parencnt)) ||
errstatus) {
pr(2);
printf("Summary:\n");
} else {
if (filename != NULL) {
fputs(filename, stdout);
fputs(": ", stdout);
}
printf(" OK\n");
}
if (oddsinglequote)
printf("\tOdd number of single quotes.\n");
if (bracecnt)
printf("\t%d too few %s braces.\n", abs(bracecnt), (bracecnt >
0 ? "closing" : "opening"));
if (sqbrakcnt)
printf("\t%d too few %s square brackets.\n", abs(sqbrakcnt), (sqbrak
> 0 ? "closing" : "opening"));
if (parencnt)
printf("\t%d too few %s parentheses.\n", abs(parencnt), (parencnt
> 0 ? "closing" : "opening"));
if (errstatus && !i)
printf("\tPossible error(s), but no net delimiter imbalance.\n");
putchar('\n');
} while (++file_index < argc);
exit(errstatus ? 2 : wstatus);
}
int mygetchar()
{
register int c;
c = fgetc(infile);
/*
if (c == ';') {
ungetc(SPACE, infile);
return(';');
}
*/
if (c == '/') { /* open comment ? */
c = fgetc(infile);
if (c != '*') {
ungetc(c, infile);
return('/');
}
commln = ln;
commindent = indent;
while (1) {
c = fgetc(infile);
if (c == EOF) { /* last comment never ended */
if (pr(2))
printf
("Comment opened line %d unclosed by end of file.\n",
commln);
break; /* Get out of this loop! */
} else if (c == '/') { /* nested comment ? */
if ((c = fgetc(infile)) == '*') {
if (pr(0))
fprintf(stdout,
"Nested comment: line %d, indent %d. First open: line
ln, indent, commln, commindent);
} else
ungetc(c, infile);
} else if (c == '*') { /* end comment ? */
if ((c = fgetc(infile)) == '/') {
if (indent != commindent && indent - 1 != commindent)
if (pr(0))
printf(
"Indent of comment close doesn't match open: lines
commln, ln, commindent, indent);
break; /* only exit from loop, except EOF */
} else
ungetc(c, infile);
} else if (c == '\n') {
do {
if (c == SPACE)
indent++;
else if (c == '\t')
indent = ((indent + 8) / 8) * 8;
else if (c == '\n') {
ln++;
indent = 0;
}
} while (isspace(c = fgetc(infile)));
ungetc(c, infile);
}
}
return(SPACE);
}
if (c == '\n' || firsttime == 1) {
firsttime = 0;
lf:
while (1) {
if (c == SPACE)
indent++;
else if (c == '\t')
indent = ((indent + 8) / 8) * 8;
else if (c == '\n') {
ln++;
indent = 0;
singlequoterr = 0;
} else {
ungetc(c, infile);
return('\n');
/*NOTREACHED*/
break;
}
c = fgetc(infile);
}
}
if (c == SPACE || c == '\t') {
do
c = fgetc(infile);
while (c == SPACE || c == '\t');
if (c != '\n') {
ungetc(c, infile);
return(SPACE);
} else
goto lf;
}
return(c);
}
/*
* administer count of error msgs. and suppress if too many
* administer the status var.s
* prepend file name to msg.
* flag error msg.s (not warnings) with '*'
*/
int pr(error)
int error;
{
int i;
if (singlequoterr)
return(0);
if (verbose) {
for (i = stackc; i > 0; i--) {
printf("%d: type ", i);
prtype(stack[i].type);
printf(", indent %d, line %d.\n", stack[i].b_indent, stack[i].b_ln);
}
}
if (error == 2) {
errnmb = 0;
errstatus = 1;
} else if (error) {
errstatus = 1;
if (errnmb < 0)
return(0);
else if (errnmb >= 9) {
errnmb = -1;
printf("Other error messages being suppressed.\n");
return(0);
}
} else {
wstatus = 1;
if (wnmb < 0)
return(0);
else if (errnmb + wnmb >= 9) {
wnmb = -1;
puts("Further warning messages being suppressed.\n");
return(0);
}
}
if (filename != NULL) {
fputs(filename, stdout);
fputs(": ", stdout);
}
if (error)
putchar('*');
if (error)
errnmb++;
else
wnmb++;
return(1);
}
void newbrak(newtype)
int newtype;
{
if (newtype == 0) {
top = stack;
stackc = 0;
} else {
top++;
stackc++;
}
if (stackc >= STACKSIZ) {
if (pr(2))
printf("***stack overflow, line %d.\n", ln);
exit(3);
}
top->type = newtype;
top->b_indent = indent;
top->b_ln = ln;
}
void prtype(typ)
int typ;
{
switch (typ) {
case BRACE:
putchar('}');
break;
case PAREN:
putchar(')');
break;
case SQBRAK:
putchar(']');
break;
case IF:
fputs("if", stdout);
break;
case IFCOND:
fputs("if-condition", stdout);
break;
case THEN:
fputs("then", stdout);
break;
case ELSE:
fputs("else", stdout);
break;
case WHLCOND:
fputs("while-condition", stdout);
break;
default:
fputs("'NULL'", stdout);
break;
}
}
void checkcloser(typ)
int (typ);
{
int i, found;
i = found = 0;
if (typ == top->type && top->b_indent == indent) {
rmbrak(1);
return;
}
while (!found && ++i < stackc && indent <= (top - i)->b_indent)
if (typ == (top - i)->type && (top - i)->b_indent == indent)
found = 1;
if (found) {
if (pr(1))
printf("Missing closer%s detected line %d:\n", (i > 1 ? "s" :
""), ln);
while (i--) {
if (pr(1)) {
fputs("\tMissing closing ", stdout);
prtype(top->type);
printf(" opened line %d.\n", top->b_ln);
}
switch (top->type) {
case BRACE:
bracecnt++;
break;
case SQBRAK:
sqbrakcnt++;
break;
case PAREN:
parencnt++;
break;
default:
break;
}
rmbrak(1);
}
rmbrak(1); /* the matching brak */
} else if (typ == top->type) {
if (indent != top->b_indent) {
if (pr(0)) {
fputs("Mismatched indent on closing ", stdout);
prtype(typ);
printf
(" lines %d, %d; indents %d, %d.\n",
top->b_ln, ln, top->b_indent, indent);
}
}
rmbrak(1);
}
else {
switch (typ) {
case BRACE:
bracecnt--;
break;
case SQBRAK:
sqbrakcnt--;
break;
case PAREN:
parencnt--;
break;
default:
break;
}
if (pr(1)) {
fputs("Muddle detected at unmatched closing ", stdout);
prtype(typ);
printf(" line %d.\n", ln);
}
}
}
/*
* removes IF from stack
* checks else's indent
*/
void checkelse()
{
int c;
while ((c = mygetchar()) == SPACE || c == '\n')
;
if (c == 'e'
&& (c = mygetchar()) == 'l'
&& (c = mygetchar()) == 's'
&& (c = mygetchar()) == 'e'
&& !isalpha(c = fgetc(infile)) && !isdigit(c)) {
ungetc(c, infile);
if (top->type == THEN)
rmbrak(1);
if (top->type != IF) {
if (pr(1))
printf("Else with no if line %d.\n", ln);
}
else if (indent + 2 < top->b_indent) {
if (pr(1))
printf("Dangling else -- bound to wrong if? \"if\" line %d, \"e
top->b_ln, ln);
}
else if (indent != top->b_indent) {
if (pr(0)) {
fputs("Wrong indent for else", stdout);
if (indent - 2 > top->b_indent)
fputs(" (missing if?)", stdout);
printf(". \"if\" line %d, \"else\" line %d.\n", top->b_ln,
ln);
}
}
if (top->type == IF)
rmbrak(1);
newbrak(ELSE);
} else {
myungetc(c);
ungetc(SPACE, infile); /* BUG?? */
/* no else so terminate the IF */
if (top->type == IF) {
rmbrak(1);
while (top->type == ELSE)
rmbrak(1);
if (top->type == THEN) {
rmbrak(1);
checkelse();
}
}
}
}
/* This function is included because Aztec C does not include an "abs"
function. If your library contains this function, this code can be
deleted.
*/
int abs(i)
{
int c;
return((i < 0) ? -i : i);
}