2BSD/src/Mail/fmt.c
/* Copyright (c) 1979 Regents of the University of California */
#
#include <stdio.h>
/*
* fmt -- format the concatenation of input files or standard input
* onto standard output. Designed for use with Mail ~|
*
* Syntax: fmt [ name ... ]
* Author: Kurt Shoens (UCB) 12/7/78
*/
#define LENGTH 72 /* Max line length in output */
#define NOSTR ((char *) 0) /* Null string pointer for lint */
int pfx; /* Current leading blank count */
int lineno; /* Current input line */
int mark; /* Last place we saw a head line */
char *calloc(); /* for lint . . . */
char *headnames[] = {"To", "Subj", "Cc", 0};
/*
* Drive the whole formatter by managing input files. Also,
* cause initialization of the output stuff and flush it out
* at the end.
*/
main(argc, argv)
char **argv;
{
register FILE *fi;
register int errs = 0;
setout();
lineno = 1;
mark = -10;
setbuf(stdout, calloc(1, BUFSIZ));
if (argc < 2) {
setbuf(stdin, calloc(1, BUFSIZ));
fmt(stdin);
oflush();
exit(0);
}
while (--argc) {
if ((fi = fopen(*++argv, "r")) == NULL) {
perror(*argv);
errs++;
continue;
}
fmt(fi);
fclose(fi);
}
oflush();
exit(errs);
}
/*
* Read up characters from the passed input file, forming lines,
* doing ^H processing, expanding tabs, stripping trailing blanks,
* and sending each line down for analysis.
*/
fmt(fi)
FILE *fi;
{
char linebuf[BUFSIZ], canonb[BUFSIZ];
register char *cp, *cp2;
register int c, col;
c = getc(fi);
while (c != EOF) {
/*
* Collect a line, doing ^H processing.
* Leave tabs for now.
*/
cp = linebuf;
while (c != '\n' && c != EOF && cp-linebuf < BUFSIZ-1) {
if (c == '\b') {
if (cp > linebuf)
cp--;
c = getc(fi);
continue;
}
if ((c < ' ' || c >= 0177) && c != '\t') {
c = getc(fi);
continue;
}
*cp++ = c;
c = getc(fi);
}
*cp = '\0';
/*
* Toss anything remaining on the input line.
*/
while (c != '\n' && c != EOF)
c = getc(fi);
/*
* Expand tabs on the way to canonb.
*/
col = 0;
cp = linebuf;
cp2 = canonb;
while (c = *cp++) {
if (c != '\t') {
col++;
if (cp2-canonb < BUFSIZ-1)
*cp2++ = c;
continue;
}
do {
if (cp2-canonb < BUFSIZ-1)
*cp2++ = ' ';
col++;
} while ((col & 07) != 0);
}
/*
* Swipe trailing blanks from the line.
*/
for (cp2--; cp2 >= canonb && *cp2 == ' '; cp2--)
;
*++cp2 = '\0';
prefix(canonb);
if (c != EOF)
c = getc(fi);
}
}
/*
* Take a line devoid of tabs and other garbage and determine its
* blank prefix. If the indent changes, call for a linebreak.
* If the input line is blank, echo the blank line on the output.
* Finally, if the line minus the prefix is a mail header, try to keep
* it on a line by itself.
*/
prefix(line)
char line[];
{
register char *cp, **hp;
register int np, h;
if (strlen(line) == 0) {
oflush();
putchar('\n');
return;
}
for (cp = line; *cp == ' '; cp++)
;
np = cp - line;
/*
* The following horrible expression attempts to avoid linebreaks
* when the indent changes due to a paragraph.
*/
if (np != pfx && (np > pfx || abs(pfx-np) > 8))
oflush();
if (h = ishead(cp))
oflush(), mark = lineno;
if (lineno - mark < 3 && lineno - mark > 0)
for (hp = &headnames[0]; *hp != (char *) 0; hp++)
if (ispref(*hp, cp)) {
h = 1;
oflush();
break;
}
if (!h && (h = (*cp == '.')))
oflush();
pfx = np;
split(cp);
if (h)
oflush();
lineno++;
}
/*
* Split up the passed line into output "words" which are
* maximal strings of non-blanks with the blank separation
* attached at the end. Pass these words along to the output
* line packer.
*/
split(line)
char line[];
{
register char *cp, *cp2;
char word[BUFSIZ];
cp = line;
while (*cp) {
cp2 = word;
while (*cp && *cp != ' ')
*cp2++ = *cp++;
/*
* Guarantee a space at end of line.
*/
if (*cp == '\0') {
*cp2++ = ' ';
if (any(cp[-1], ".:!"))
*cp2++ = ' ';
}
while (*cp == ' ')
*cp2++ = *cp++;
*cp2 = '\0';
pack(word);
}
}
/*
* Output section.
* Build up line images from the words passed in. Prefix
* each line with correct number of blanks. The buffer "outbuf"
* contains the current partial line image, including prefixed blanks.
* "outp" points to the next available space therein. When outp is NOSTR,
* there ain't nothing in there yet. At the bottom of this whole mess,
* leading tabs are reinserted.
*/
char outbuf[BUFSIZ]; /* Sandbagged output line image */
char *outp; /* Pointer in above */
/*
* Initialize the output section.
*/
setout()
{
outp = NOSTR;
}
/*
* Pack a word onto the output line. If this is the beginning of
* the line, push on the appropriately-sized string of blanks first.
* If the word won't fit on the current line, flush and begin a new
* line. If the word is too long to fit all by itself on a line,
* just give it its own and hope for the best.
*/
pack(word)
char word[];
{
register char *cp;
register int s, t;
if (outp == NOSTR)
leadin();
t = strlen(word);
s = outp-outbuf;
if (t+s <= LENGTH) {
/*
* In like flint!
*/
for (cp = word; *cp; *outp++ = *cp++)
;
return;
}
if (s > pfx) {
oflush();
leadin();
}
for (cp = word; *cp; *outp++ = *cp++)
;
}
/*
* If there is anything on the current output line, send it on
* its way. Set outp to NOSTR to indicate the absence of the current
* line prefix.
*/
oflush()
{
if (outp == NOSTR)
return;
*outp = '\0';
tabulate(outbuf);
outp = NOSTR;
}
/*
* Take the passed line buffer, insert leading tabs where possible, and
* output on standard output (finally).
*/
tabulate(line)
char line[];
{
register char *cp, *cp2;
register int b, t;
/*
* Toss trailing blanks in the output line.
*/
cp = line + strlen(line) - 1;
while (cp >= line && *cp == ' ')
cp--;
*++cp = '\0';
/*
* Count the leading blank space and tabulate.
*/
for (cp = line; *cp == ' '; cp++)
;
b = cp-line;
t = b >> 3;
b &= 07;
if (t > 0)
do
putc('\t', stdout);
while (--t);
if (b > 0)
do
putc(' ', stdout);
while (--b);
while (*cp)
putc(*cp++, stdout);
putc('\n', stdout);
}
/*
* Initialize the output line with the appropriate number of
* leading blanks.
*/
leadin()
{
register int b;
register char *cp;
for (b = 0, cp = outbuf; b < pfx; b++)
*cp++ = ' ';
outp = cp;
}
/*
* Save a string in dynamic space.
* This little goodie is needed for
* a headline detector in head.c
*/
char *
savestr(str)
char str[];
{
register char *top;
top = calloc(strlen(str) + 1, 1);
if (top == NOSTR) {
fprintf(stderr, "fmt: Ran out of memory\n");
exit(1);
}
copy(str, top);
return(top);
}
/*
* Is s1 a prefix of s2??
*/
ispref(s1, s2)
register char *s1, *s2;
{
while (*s1++ == *s2)
;
return(*s1 == '\0');
}