/*
* annosbr.c -- prepend annotation to messages
*
* $Id: annosbr.c,v 1.6 2005/12/07 21:25:47 jon Exp $
*
* This code is Copyright (c) 2002, by the authors of nmh. See the
* COPYRIGHT file in the root directory of the nmh distribution for
* complete copyright information.
*/
#include <h/mh.h>
#include <h/tws.h>
#include <fcntl.h>
#include <errno.h>
#include <utime.h>
/*
* static prototypes
*/
static int annosbr (int, char *, char *, char *, int, int, int, int);
/*
* This "local" global and the annopreserve() function are a hack that allows additional
* functionality to be added to anno without piling on yet another annotate() argument.
*/
static int preserve_actime_and_modtime = 0; /* set to preserve access and modification times on annotated message */
int
annotate (char *file, char *comp, char *text, int inplace, int datesw, int delete, int append)
{
int i, fd;
struct utimbuf b;
struct stat s;
/* open and lock the file to be annotated */
if ((fd = lkopen (file, O_RDWR, 0)) == NOTOK) {
switch (errno) {
case ENOENT:
break;
default:
admonish (file, "unable to lock and open");
break;
}
return 1;
}
if (stat(file, &s) == -1) {
advise("can't get access and modification times for %s", file);
preserve_actime_and_modtime = 0;
}
b.actime = s.st_atime;
b.modtime = s.st_mtime;
i = annosbr (fd, file, comp, text, inplace, datesw, delete, append);
if (preserve_actime_and_modtime && utime(file, &b) == -1)
advise("can't set access and modification times for %s", file);
lkclose (fd, file);
return i;
}
/*
* Produce a listing of all header fields (annotations) whose field name matches
* comp. Number the listing if number is set. Treate the field bodies as path
* names and just output the last component unless text is non-NULL. We don't
* care what text is set to.
*/
void
annolist(char *file, char *comp, char *text, int number)
{
int c; /* current character */
int count; /* header field (annotation) counter */
char *cp; /* miscellaneous character pointer */
char *field; /* buffer for header field */
int field_size; /* size of field buffer */
FILE *fp; /* file pointer made from locked file descriptor */
int length; /* length of field name */
int n; /* number of bytes written */
char *sp; /* another miscellaneous character pointer */
if ((fp = fopen(file, "r")) == (FILE *)0)
adios(file, "unable to open");
/*
* Allocate a buffer to hold the header components as they're read in.
* This buffer might need to be quite large, so we grow it as needed.
*/
if ((field = (char *)malloc(field_size = 256)) == (char *)0)
adios(NULL, "can't allocate field buffer.");
/*
* Get the length of the field name since we use it often.
*/
length = strlen(comp);
count = 0;
do {
/*
* Get a line from the input file, growing the field buffer as needed. We do this
* so that we can fit an entire line in the buffer making it easy to do a string
* comparison on both the field name and the field body which might be a long path
* name.
*/
for (n = 0, cp = field; (c = getc(fp)) != EOF; *cp++ = c) {
if (c == '\n' && (c = getc(fp)) != ' ' && c != '\t') {
(void)ungetc(c, fp);
c = '\n';
break;
}
if (++n >= field_size - 1) {
if ((field = (char *)realloc((void *)field, field_size += 256)) == (char *)0)
adios(NULL, "can't grow field buffer.");
cp = field + n - 1;
}
}
/*
* NUL-terminate the field..
*/
*cp = '\0';
if (strncasecmp(field, comp, length) == 0 && field[length] == ':') {
for (cp = field + length + 1; *cp == ' ' || *cp == '\t'; cp++)
;
if (number)
(void)printf("%d\t", ++count);
if (text == (char *)0 && (sp = strrchr(cp, '/')) != (char *)0)
cp = sp + 1;
(void)printf("%s\n", cp);
}
} while (*field != '\0' && *field != '-');
/*
* Clean up.
*/
free(field);
(void)fclose(fp);
return;
}
/*
* Set the preserve-times flag. This hack eliminates the need for an additional argument to annotate().
*/
void
annopreserve(int preserve)
{
preserve_actime_and_modtime = preserve;
return;
}
static int
annosbr (int fd, char *file, char *comp, char *text, int inplace, int datesw, int delete, int append)
{
int mode, tmpfd;
char *cp, *sp;
char buffer[BUFSIZ], tmpfil[BUFSIZ];
struct stat st;
FILE *tmp;
int c; /* current character */
int count; /* header field (annotation) counter */
char *field; /* buffer for header field */
int field_size; /* size of field buffer */
FILE *fp; /* file pointer made from locked file descriptor */
int length; /* length of field name */
int n; /* number of bytes written */
mode = fstat (fd, &st) != NOTOK ? (st.st_mode & 0777) : m_gmprot ();
strncpy (tmpfil, m_scratch (file, "annotate"), sizeof(tmpfil));
if ((tmp = fopen (tmpfil, "w")) == NULL) {
admonish (tmpfil, "unable to create");
return 1;
}
chmod (tmpfil, mode);
/*
* We're going to need to copy some of the message file to the temporary
* file while examining the contents. Convert the message file descriptor
* to a file pointer since it's a lot easier and more efficient to use
* stdio for this. Also allocate a buffer to hold the header components
* as they're read in. This buffer is grown as needed later.
*/
if (delete >= -1 || append != 0) {
if ((fp = fdopen(fd, "r")) == (FILE *)0)
adios(NULL, "unable to fdopen file.");
if ((field = (char *)malloc(field_size = 256)) == (char *)0)
adios(NULL, "can't allocate field buffer.");
}
/*
* We're trying to delete a header field (annotation )if the delete flag is
* not -2 or less. A value greater than zero means that we're deleting the
* nth header field that matches the field (component) name. A value of
* zero means that we're deleting the first field in which both the field
* name matches the component name and the field body matches the text.
* The text is matched in its entirety if it begins with a slash; otherwise
* the text is matched against whatever portion of the field body follows
* the last slash. This allows matching of both absolute and relative path
* names. This is because this functionality was added to support attachments.
* It might be worth having a separate flag to indicate path name matching to
* make it more general. A value of -1 means to delete all matching fields.
*/
if (delete >= -1) {
/*
* Get the length of the field name since we use it often.
*/
length = strlen(comp);
/*
* Initialize the field counter. This is only used if we're deleting by
* number.
*/
count = 0;
/*
* Copy lines from the input file to the temporary file until we either find the one
* that we're looking for (which we don't copy) or we reach the end of the headers.
* Both a blank line and a line beginning with a - terminate the headers so that we
* can handle both drafts and RFC-2822 format messages.
*/
do {
/*
* Get a line from the input file, growing the field buffer as needed. We do this
* so that we can fit an entire line in the buffer making it easy to do a string
* comparison on both the field name and the field body which might be a long path
* name.
*/
for (n = 0, cp = field; (c = getc(fp)) != EOF; *cp++ = c) {
if (c == '\n' && (c = getc(fp)) != ' ' && c != '\t') {
(void)ungetc(c, fp);
c = '\n';
break;
}
if (++n >= field_size - 1) {
if ((field = (char *)realloc((void *)field, field_size *= 2)) == (char *)0)
adios(NULL, "can't grow field buffer.");
cp = field + n - 1;
}
}
/*
* NUL-terminate the field..
*/
*cp = '\0';
/*
* Check for a match on the field name. We delete the line by not copying it to the
* temporary file if
*
* o The delete flag is 0, meaning that we're going to delete the first matching
* field, and the text is NULL meaning that we don't care about the field body.
*
* o The delete flag is 0, meaning that we're going to delete the first matching
* field, and the text begins with a / meaning that we're looking for a full
* path name, and the text matches the field body.
*
* o The delete flag is 0, meaning that we're going to delete the first matching
* field, the text does not begin with a / meaning that we're looking for the
* last path name component, and the last path name component matches the text.
*
* o The delete flag is positive meaning that we're going to delete the nth field
* with a matching field name, and this is the nth matching field name.
*
* o The delete flag is -1 meaning that we're going to delete all fields with a
* matching field name.
*/
if (strncasecmp(field, comp, length) == 0 && field[length] == ':') {
if (delete == 0) {
if (text == (char *)0)
break;
for (cp = field + length + 1; *cp == ' ' || *cp == '\t'; cp++)
;
if (*text == '/') {
if (strcmp(cp, text) == 0)
break;
}
else {
if ((sp = strrchr(cp, '/')) != (char *)0)
cp = sp + 1;
if (strcmp(cp, text) == 0)
break;
}
}
else if (delete == -1)
continue;
else if (++count == delete)
break;
}
/*
* This line wasn't a match so copy it to the temporary file.
*/
if ((n = fputs(field, tmp)) == EOF || (c == '\n' && fputc('\n', tmp) == EOF))
adios(NULL, "unable to write temporary file.");
} while (*field != '\0' && *field != '-');
/*
* Get rid of the field buffer because we're done with it.
*/
free((void *)field);
}
else {
/*
* Find the end of the headers before adding the annotations if we're
* appending instead of the default prepending. A special check for
* no headers is needed if appending.
*/
if (append) {
/*
* Copy lines from the input file to the temporary file until we
* reach the end of the headers.
*/
if ((c = getc(fp)) == '\n')
rewind(fp);
else {
(void)putc(c, tmp);
while ((c = getc(fp)) != EOF) {
(void)putc(c, tmp);
if (c == '\n') {
(void)ungetc(c = getc(fp), fp);
if (c == '\n' || c == '-')
break;
}
}
}
}
if (datesw)
fprintf (tmp, "%s: %s\n", comp, dtimenow (0));
if ((cp = text)) {
do {
while (*cp == ' ' || *cp == '\t')
cp++;
sp = cp;
while (*cp && *cp++ != '\n')
continue;
if (cp - sp)
fprintf (tmp, "%s: %*.*s", comp, cp - sp, cp - sp, sp);
} while (*cp);
if (cp[-1] != '\n' && cp != text)
putc ('\n', tmp);
}
}
fflush (tmp);
/*
* We've been messing with the input file position. Move the input file
* descriptor to the current place in the file because the stock data
* copying routine uses the descriptor, not the pointer.
*/
if (append || delete >= -1) {
if (lseek(fd, (off_t)ftell(fp), SEEK_SET) == (off_t)-1)
adios(NULL, "can't seek.");
}
cpydata (fd, fileno (tmp), file, tmpfil);
fclose (tmp);
if (inplace) {
if ((tmpfd = open (tmpfil, O_RDONLY)) == NOTOK)
adios (tmpfil, "unable to open for re-reading");
lseek (fd, (off_t) 0, SEEK_SET);
/*
* We're making the file shorter if we're deleting a header field
* so the file has to be truncated or it will contain garbage.
*/
if (delete >= -1 && ftruncate(fd, 0) == -1)
adios(tmpfil, "unable to truncate.");
cpydata (tmpfd, fd, tmpfil, file);
close (tmpfd);
unlink (tmpfil);
} else {
strncpy (buffer, m_backup (file), sizeof(buffer));
if (rename (file, buffer) == NOTOK) {
switch (errno) {
case ENOENT: /* unlinked early - no annotations */
unlink (tmpfil);
break;
default:
admonish (buffer, "unable to rename %s to", file);
break;
}
return 1;
}
if (rename (tmpfil, file) == NOTOK) {
admonish (file, "unable to rename %s to", tmpfil);
return 1;
}
}
/*
* Close the delete file so that we don't run out of file pointers if
* we're doing piles of files. Note that this will make the close() in
* lkclose() fail, but that failure is ignored so it's not a problem.
*/
if (delete >= -1)
(void)fclose(fp);
return 0;
}
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