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/*
* Copyright (c) 1986 by The Governing Council of the University of Toronto.
* Authored by Rayan Zachariassen for University of Toronto Computing Services.
*/
#include <stdio.h>
#include <ctype.h>
#include <sys/types.h>
#ifndef TRUE
#define TRUE 1
#endif
/*
* Copy the message on stdin to the fp output.
*
* This routine should:
* - fold message header lines according to rfc822, by prepending a tab
* to each continuation line and breaking it at the right place.
* - fold message body lines, prepending a '+ ' to each continuation line.
* - ensure message terminates with a newline.
* - escape '.'s in the first column of body lines by prepending a '.'
*/
copydata(fp)
FILE *fp;
{
register char *cp, *s;
register int n;
char buf[BUFSIZ], linebuf[BUFSIZ];
s = linebuf;
while ((n = fread(buf, 1, sizeof buf, stdin)) > 0) {
for (cp = buf; n-- > 0; ++cp) {
if (*cp == '\n' || s - linebuf >= BUFSIZ - 5) {
*s = '\0';
doline(linebuf, fp);
s = linebuf;
continue;
} else if (*cp != '\t' && (*cp < ' ' || *cp > '\176')) {
if (*cp & 0200) {
*s++ = 'M';
*s++ = '-';
*cp &= ~0200;
}
if (*cp != '\t' && (*cp < ' ' || *cp > '\176')){
*s++ = '~';
*cp = (*cp + 0100)&~0200;
}
}
*s++ = *cp;
}
}
if (s > linebuf) {
*s = '\0';
doline(linebuf, fp);
}
}
doline(buf, fp)
char buf[];
FILE *fp;
{
register char *cp, *s;
register int col;
int maxwidth;
char *ocp, *cutoff, *semicolon, *nonalnum;
static int inheader = 1;
/* find end of line, not including trailing blanks */
for (cp = buf; *cp != NULL; cp++)
continue;
while (*--cp == ' ')
continue;
*++cp = '\0';
/* a blank line separates header from body */
if (inheader && cp == buf)
inheader = 0;
maxwidth = 80;
ocp = buf;
if (inheader) {
do {
col = 1;
semicolon = nonalnum = NULL;
for (s = ocp; s < cp && col <= maxwidth; s++) {
if (*s == ';')
semicolon = s;
else if (isascii(*s) && !isalnum(*s))
nonalnum = s;
if (*s == '\t')
col = ((col + 7)>>3)<<3;
col++;
}
if (s >= cp) {
fputs(ocp, fp);
fputs("\n", fp);
return;
}
if (semicolon > ocp)
cutoff = ++semicolon;
else if (nonalnum)
cutoff = ++nonalnum;
else
cutoff = (ocp + maxwidth > cp) ? cp :
ocp + maxwidth;
fwrite(ocp, 1, cutoff - ocp, fp);
ocp = cutoff;
while (*ocp == ' ')
ocp++;
fputs("\n\t", fp);
maxwidth = 72; /* 80 - tab */
} while (TRUE);
} else {
/* escape dot in first column by adding another one */
if (*ocp == '.') {
fputs(".", fp);
--maxwidth;
}
/* handle line continuation for lines >80 columns */
do {
cutoff = NULL;
col = 1;
for (s = ocp; s<cp && col <= maxwidth; s++) {
if (isascii(*s) && !isalnum(*s))
cutoff = s;
if (*s == '\t')
col = ((col + 7)>>3)<<3;
col++;
}
/* line done? */
if (s == cp) {
fputs(ocp, fp);
fputs("\n", fp);
return;
}
if (cutoff < ocp)
cutoff = (ocp + maxwidth > cp) ? cp :
ocp + maxwidth;
else
cutoff++;
fwrite(ocp, 1, cutoff - ocp, fp);
ocp = cutoff;
/* '+ ' indicates line continuation */
fputs("\n+ ", fp);
maxwidth = 78; /* 80 - '+ ' */
} while (TRUE);
}
}
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