/*
* sz is size of 'line' buffer in bytes. Must be reasonably
* long enough to hold one physical real-world e-mail line.
*/
static int read_one_header_line(char *line, int sz, FILE *in)
{
int len;
/*
* We will read at most (sz-1) bytes and then potentially
* re-add NUL after it. Accessing line[sz] after this is safe
* and we can allow len to grow up to and including sz.
*/
sz--;
/* Get the first part of the line. */
if (!fgets(line, sz, in))
return 0;
/*
* Is it an empty line or not a valid rfc2822 header?
* If so, stop here, and return false ("not a header")
*/
len = eatspace(line);
if (!len || !is_rfc2822_header(line)) {
/* Re-add the newline */
line[len] = '\n';
line[len + 1] = '\0';
return 0;
}
/*
* Now we need to eat all the continuation lines..
* Yuck, 2822 header "folding"
*/
for (;;) {
int peek, addlen;
static char continuation[1000];
peek = fgetc(in); ungetc(peek, in);
if (peek != ' ' && peek != '\t')
break;
if (!fgets(continuation, sizeof(continuation), in))
break;
addlen = eatspace(continuation);
if (len < sz - 1) {
if (addlen >= sz - len)
addlen = sz - len - 1;
memcpy(line + len, continuation, addlen);
line[len] = '\n';
len += addlen;
}
}
line[len] = 0;
return 1;
}
static int read_one_header_line(struct strbuf *line, FILE *in)
{
struct strbuf continuation = STRBUF_INIT;
/* Get the first part of the line. */
if (strbuf_getline_lf(line, in))
return 0;
/*
* Is it an empty line or not a valid rfc2822 header?
* If so, stop here, and return false ("not a header")
*/
strbuf_rtrim(line);
if (!line->len || !is_rfc2822_header(line)) {
/* Re-add the newline */
strbuf_addch(line, '\n');
return 0;
}
/*
* Now we need to eat all the continuation lines..
* Yuck, 2822 header "folding"
*/
for (;;) {
int peek;
peek = fgetc(in);
if (peek == EOF)
break;
ungetc(peek, in);
if (peek != ' ' && peek != '\t')
break;
if (strbuf_getline_lf(&continuation, in))
break;
continuation.buf[0] = ' ';
strbuf_rtrim(&continuation);
strbuf_addbuf(line, &continuation);
}
strbuf_release(&continuation);
return 1;
}
