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CFLOW.C
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1985-08-11
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6KB
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/*
** CFLOW.C : find module call structure of c program
** refer to cflow.doc for how to use
** Mark Ellington
** 05-27-84
*/
#define TRUE 1
#define FALSE 0
#define ERROR -1
#define EOF -1
#include printf.c
#include b:cflolib.c80 /* not needed with BDS? */
int fptr; /* input file pointer */
int level; /* keep track of level of open "{"s */
char name[100]; /* module name buffer */
char ins[100]; /* source input line buffer */
int curchar; /* current character in input line buffer
array subscript */
main(argc,argv)
int argc; char *argv[];
{
printf("\nCFLOW --> function declarations and calls in C source");
printf("\n by Mark Ellington");
if (argc != 2) {
printf("\nusage: cflow [infilename.ext] ");
exit();
}
if ((fptr = fopen(argv[1],"r")) == FALSE) {
printf("\nCan't open %s\n",argv[1]);
exit();
}
printf("\nSource file: %s",argv[1]);
modules();
fclose(fptr);
}
modules() /* find function declarations and calls */
{
int j;
char c;
int incom; /* comment flag */
int decl; /* module declaration line flag */
int lastlin; /* last line of file flag */
int quoted; /* within " quotes */
int header; /* within function header (before 1st '{') */
incom = lastlin = quoted = header = FALSE;
level = 0;
do {
lastlin = fgets(); /* read a line of source */
decl = FALSE; /* assume nothing */
curchar = 0;
while (curchar < 100) {/* read for significant characters */
if (skipline()) break;
quotes(); /* skip single quoted character */
incom = comment(incom); /* true if in comment */
c = ins[curchar];
/* read for significant characters */
if (!incom) {
/* skip double quoted strings */
if (c == '\042') quoted = !quoted;
if (!quoted) {
switch(c) {
case '{' :
level++;
header = FALSE;
break;
case '}' :
level--;
break;
/* "(" always follows function call */
/* or declaration */
case '(' :
if (!ischar(ins[curchar-1]))
break;
lookbak(curchar);
j = modname();
if (!j) break;
else decl = TRUE;
if (j == 2)
header = TRUE;
break;
default :
break;
}
}
}
++curchar; /* next character */
}
/* display argument declarations */
comout(ins);
if (header && !decl) printf("%s",ins);
} while (lastlin); /* = 0 if last line */
}
/* skip this line ? */
skipline()
{
char c;
c = ins[curchar];
if (c == '\0') return(TRUE); /* end of line */
else if (c == '#') /* skip macro defs */
if (curchar < 5) /* at beginning of line */
if (!strcmp("define",&ins[curchar+1]))
return(TRUE);
else return(FALSE); /* no */
}
/* skip characters quoted (for instance '}' would throw off level count */
quotes()
{
if (flowchar(ins[curchar])) /* test critical chars only */
if (ins[curchar+1] == '\047') /* next char single quote? */
if (curchar+2 < 100) /* don't pass end of string */
curchar = curchar + 2; /* skip past quote */
}
/* return TRUE if entering comment, FALSE if exiting */
comment(incom)
int incom;
{
if (ins[curchar] == '/') {
if (ins[curchar+1] == '*')
if (curchar + 1 < 100) /* stay within string */
return(TRUE);
else if (ins[curchar-1] == '*')
if (curchar - 1 >= 0) /* stay within string */
return(FALSE);
}
else return(incom); /* unchanged */
}
/* look back from position n in string. called with n indicating '('.
determine function name */
lookbak(n)
int n;
{
int i;
while (!ischar(ins[n])) {
if (n == 0) break;
--n;
}
/* find leading blank */
while (ischar(ins[n-1])) {
if (n == 0) break;
--n;
}
/* save name */
/* include variable declarations if module declaration */
i = 0;
if (level == 0) {
while (ins[n]) /* full line if declaration */
name[i++] = ins[n++];
}
else {
while (ischar(ins[n])) /* function call within function */
name[i++] = ins[n++];
}
name[i] = '\0';
comout(name); /* remove comment from name string */
}
/* terminate string at comment */
comout(s)
char *s;
{
char c;
while(c = *s++)
if (c == '/')
if (*s == '*') {
--s;
*s++ = '\n';
*s = '\0';
break;
}
}
/* display module name with indentation according to { level */
/* returns 0 if not module, 1 if call within module, 2 if */
/* module declaration */
modname()
{
int j;
if (unreserved()) { /* test if builtin like while */
if (level == 0) {
printf("\n\n\n");
printf("**\n");
comout(ins);
printf("%s",ins);
return(2);
}
else {
printf("\n");
for (j=0; j < level; ++j)
putchar('\t');
printf("%s()",name);
return(1);
}
}
return(0);
}
/* test for names that are operators not functions */
unreserved()
{
if (!strcmp(name,"return")) return(0);
else if (!strcmp(name,"if")) return(0);
else if (!strcmp(name,"while")) return(0);
else if (!strcmp(name,"for")) return(0);
else if (!strcmp(name,"switch")) return(0);
else return(1);
}
/* test if character is one that program tracks */
flowchar(c)
char c;
{
if (c == '{' || c == '}' || c == '\"') return(TRUE);
else return(FALSE);
}
/* test for character */
ischar(c)
char c;
{
if (isalpha(c) || isdigit(c)) return(TRUE);
else return(FALSE);
}
/* read a line of source */
fgets()
{
char ch, *s;
s = ins;
while ((ch = getc(fptr)) != EOF) {
*s++ = ch;
if (ch == '\n') {
*s = '\0';
return(TRUE);
}
}
*s = '\0';
return(FALSE);
}