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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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v_09_10
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9n10126a
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1991-08-10
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202 lines
/*********************************************************
* MAXL.C: Analyze line lengths to help slim down
* code listings for publications such as CUJ
* Written by Leor Zolman, 12/89, 2/91
* What it does:
* Scans the input file, keeping track of the number of
* lines of each varying length encountered.
* Displays first instance of each of the n longest
* line lengths encountered, along with frequency.
* Hard tab interpretation may be set to any value.
*
* Usage: maxl [-t#] [-d%] [-f$] filename
* # = soft tab setting (defaults to 4)
* % = how many different lengths to display (def. 3)
* $ = flag lines longer than this length (def. 79)
* Compile:
* Borland C:
* bcc maxl.c
* Xenix C:
* cc maxl.c -o maxl
********************************************************/
#include <stdio.h>
#define MAXLINE 300 /* longest allowable line */
#define DEFAULT_TAB 4 /* default soft tab setting */
#define DIFF_SIZES 3 /* # of diff. sizes to show */
#define DEF_FLAG 79 /* flag lines longer than...*/
void putrule(int); /* draw a horizontal line */
void putline(char *, int);
struct line {
int first; /* line # of first instance */
char *text; /* the text of 1st instance */
int how_many; /* # of lines that length */
} lines[MAXLINE]; /* one for each length */
int tabstop = DEFAULT_TAB;
int diffsizes = DIFF_SIZES;
int flaglen = DEF_FLAG;
void main(argc, argv)
int argc;
char **argv;
{
int v_col; /* virtual column number */
int lineno; /* line number of current line */
char lbuf[MAXLINE]; /* input line buffer */
char c, *lp;
FILE *fp;
int i, j;
for (i = 1; i < argc; i++)
if (argv[i][0] == '-')
{
switch (tolower(argv[i][1]))
{
case 't': tabstop = atoi(&argv[i][2]);
break;
case 'd': diffsizes = atoi(&argv[i][2]);
break;
case 'f': flaglen = atoi(&argv[i][2]);
break;
default: printf("Unknown option: '%s'\n",
argv[i]);
exit(0);
}
for (j = i; j < argc - 1; j++)
argv[j] = argv[j + 1];
argc--;
i--;
}
if (argc != 2)
{
fprintf(stderr,
"Usage: %s [-t#] [-d#] [f#] file\n", argv[0]);
fprintf(stderr,
"-t#: Set hard tab value\n");
fprintf(stderr,
"-d#: Set number of different lengths to show\n");
fprintf(stderr,
"-f#: Flag lines longer than # characters\n");
exit(1);
}
if ((fp = fopen(argv[1], "r")) == NULL)
exit(printf("Can't open %s for input.\n", argv[1]));
for (i = 0; i <= MAXLINE; i++)
lines[i].how_many = 0; /* none found yet */
lineno = 1;
while (fgets(lbuf, MAXLINE, fp) != NULL)
{
v_col = 1; /* track virtual column # */
for (lp = lbuf; c = *lp; lp++)
{
if (c == '\n') /* newline is end of line */
break;
if (c == '\t') /* tab is interpreted as a */
while (v_col++ % tabstop) /* # of spaces */
;
else if (c == '\r') /* CR sans newline is a */
{ /* special twisted case */
fprintf(stderr,
"WARNING: CR before newline in line %d\n",
lineno);
v_col = 1; /* back to the left margin */
}
else
v_col++; /* all printing chars */
}
v_col--; /* adjust to ending col. # */
if (v_col >= flaglen)
fprintf(stderr,
"\aLine #%d: %d columns exceeds maximum (%d)\n",
lineno, v_col , flaglen);
/* bump counter for length */
if (!lines[v_col].how_many++) /* first time for */
{ /* this length? if so... */
lines[v_col].first = lineno; /* save line #, */
if ((lines[v_col].text = /* & save text */
(char *) malloc(strlen(lbuf) + 1)) == NULL)
{
fprintf(stderr,
"Out of memory in line %d\n", lineno);
exit(1);
}
strcpy(lines[v_col].text, lbuf);
}
lineno++;
}
printf("\n");
j = 0; /* # of diff. lengths shown */
for (i = MAXLINE - 1; i > 0; i--) /* display results */
{
if (!lines[i].how_many)
continue;
printf("Length: %d First instance: line #%d",
i, lines[i].first);
printf(" Quantity: %d\n", lines[i].how_many);
putline(lines[i].text, i);
if (++j == diffsizes)
break;
printf("\n");
}
fclose(fp);
}
/*
* putline(): Display a line of text, with rule line
* before and after
*/
void putline(line, length)
char *line;
int length;
{
char *lp, c;
int v_col;
putrule(length);
for (lp = line, v_col = 1; c = *lp; lp++)
switch (c)
{
case '\t': /* translate tabs to spaces */
do
putchar(' ');
while (v_col++ % tabstop);
break;
default:
putchar(c);
v_col++;
}
putrule(length);
}
/*
* putrule(): display a horizontal line so trailing
* whitespace is detectable
*/
void putrule(ncols)
int ncols;
{
int i;
for (i = 0; i < ncols; i++)
putchar('=');
putchar('\n');
}