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author | delphij <delphij@FreeBSD.org> | 2009-05-08 23:34:35 +0000 |
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committer | delphij <delphij@FreeBSD.org> | 2009-05-08 23:34:35 +0000 |
commit | d069efd47cacc3156036ed37d5532d6a1d4f55c3 (patch) | |
tree | 2526f6b109843b646672c1537476dc51e56c0454 /contrib/less/ifile.c | |
parent | 6aa3e25391d160482339ee072c010bcd22dfbbd1 (diff) | |
download | FreeBSD-src-d069efd47cacc3156036ed37d5532d6a1d4f55c3.zip FreeBSD-src-d069efd47cacc3156036ed37d5532d6a1d4f55c3.tar.gz |
Flatten all tags of the dist tree of less.
Diffstat (limited to 'contrib/less/ifile.c')
-rw-r--r-- | contrib/less/ifile.c | 346 |
1 files changed, 0 insertions, 346 deletions
diff --git a/contrib/less/ifile.c b/contrib/less/ifile.c deleted file mode 100644 index 96e8e60..0000000 --- a/contrib/less/ifile.c +++ /dev/null @@ -1,346 +0,0 @@ -/* - * Copyright (C) 1984-2007 Mark Nudelman - * - * You may distribute under the terms of either the GNU General Public - * License or the Less License, as specified in the README file. - * - * For more information about less, or for information on how to - * contact the author, see the README file. - */ - - -/* - * An IFILE represents an input file. - * - * It is actually a pointer to an ifile structure, - * but is opaque outside this module. - * Ifile structures are kept in a linked list in the order they - * appear on the command line. - * Any new file which does not already appear in the list is - * inserted after the current file. - */ - -#include "less.h" - -extern IFILE curr_ifile; - -struct ifile { - struct ifile *h_next; /* Links for command line list */ - struct ifile *h_prev; - char *h_filename; /* Name of the file */ - void *h_filestate; /* File state (used in ch.c) */ - int h_index; /* Index within command line list */ - int h_hold; /* Hold count */ - char h_opened; /* Has this ifile been opened? */ - struct scrpos h_scrpos; /* Saved position within the file */ -}; - -/* - * Convert an IFILE (external representation) - * to a struct file (internal representation), and vice versa. - */ -#define int_ifile(h) ((struct ifile *)(h)) -#define ext_ifile(h) ((IFILE)(h)) - -/* - * Anchor for linked list. - */ -static struct ifile anchor = { &anchor, &anchor, NULL, NULL, 0, 0, '\0', - { NULL_POSITION, 0 } }; -static int ifiles = 0; - - static void -incr_index(p, incr) - register struct ifile *p; - int incr; -{ - for (; p != &anchor; p = p->h_next) - p->h_index += incr; -} - -/* - * Link an ifile into the ifile list. - */ - static void -link_ifile(p, prev) - struct ifile *p; - struct ifile *prev; -{ - /* - * Link into list. - */ - if (prev == NULL) - prev = &anchor; - p->h_next = prev->h_next; - p->h_prev = prev; - prev->h_next->h_prev = p; - prev->h_next = p; - /* - * Calculate index for the new one, - * and adjust the indexes for subsequent ifiles in the list. - */ - p->h_index = prev->h_index + 1; - incr_index(p->h_next, 1); - ifiles++; -} - -/* - * Unlink an ifile from the ifile list. - */ - static void -unlink_ifile(p) - struct ifile *p; -{ - p->h_next->h_prev = p->h_prev; - p->h_prev->h_next = p->h_next; - incr_index(p->h_next, -1); - ifiles--; -} - -/* - * Allocate a new ifile structure and stick a filename in it. - * It should go after "prev" in the list - * (or at the beginning of the list if "prev" is NULL). - * Return a pointer to the new ifile structure. - */ - static struct ifile * -new_ifile(filename, prev) - char *filename; - struct ifile *prev; -{ - register struct ifile *p; - - /* - * Allocate and initialize structure. - */ - p = (struct ifile *) ecalloc(1, sizeof(struct ifile)); - p->h_filename = save(filename); - p->h_scrpos.pos = NULL_POSITION; - p->h_opened = 0; - p->h_hold = 0; - p->h_filestate = NULL; - link_ifile(p, prev); - return (p); -} - -/* - * Delete an existing ifile structure. - */ - public void -del_ifile(h) - IFILE h; -{ - register struct ifile *p; - - if (h == NULL_IFILE) - return; - /* - * If the ifile we're deleting is the currently open ifile, - * move off it. - */ - unmark(h); - if (h == curr_ifile) - curr_ifile = getoff_ifile(curr_ifile); - p = int_ifile(h); - unlink_ifile(p); - free(p->h_filename); - free(p); -} - -/* - * Get the ifile after a given one in the list. - */ - public IFILE -next_ifile(h) - IFILE h; -{ - register struct ifile *p; - - p = (h == NULL_IFILE) ? &anchor : int_ifile(h); - if (p->h_next == &anchor) - return (NULL_IFILE); - return (ext_ifile(p->h_next)); -} - -/* - * Get the ifile before a given one in the list. - */ - public IFILE -prev_ifile(h) - IFILE h; -{ - register struct ifile *p; - - p = (h == NULL_IFILE) ? &anchor : int_ifile(h); - if (p->h_prev == &anchor) - return (NULL_IFILE); - return (ext_ifile(p->h_prev)); -} - -/* - * Return a different ifile from the given one. - */ - public IFILE -getoff_ifile(ifile) - IFILE ifile; -{ - IFILE newifile; - - if ((newifile = prev_ifile(ifile)) != NULL_IFILE) - return (newifile); - if ((newifile = next_ifile(ifile)) != NULL_IFILE) - return (newifile); - return (NULL_IFILE); -} - -/* - * Return the number of ifiles. - */ - public int -nifile() -{ - return (ifiles); -} - -/* - * Find an ifile structure, given a filename. - */ - static struct ifile * -find_ifile(filename) - char *filename; -{ - register struct ifile *p; - - for (p = anchor.h_next; p != &anchor; p = p->h_next) - if (strcmp(filename, p->h_filename) == 0) - return (p); - return (NULL); -} - -/* - * Get the ifile associated with a filename. - * If the filename has not been seen before, - * insert the new ifile after "prev" in the list. - */ - public IFILE -get_ifile(filename, prev) - char *filename; - IFILE prev; -{ - register struct ifile *p; - - if ((p = find_ifile(filename)) == NULL) - p = new_ifile(filename, int_ifile(prev)); - return (ext_ifile(p)); -} - -/* - * Get the filename associated with a ifile. - */ - public char * -get_filename(ifile) - IFILE ifile; -{ - if (ifile == NULL) - return (NULL); - return (int_ifile(ifile)->h_filename); -} - -/* - * Get the index of the file associated with a ifile. - */ - public int -get_index(ifile) - IFILE ifile; -{ - return (int_ifile(ifile)->h_index); -} - -/* - * Save the file position to be associated with a given file. - */ - public void -store_pos(ifile, scrpos) - IFILE ifile; - struct scrpos *scrpos; -{ - int_ifile(ifile)->h_scrpos = *scrpos; -} - -/* - * Recall the file position associated with a file. - * If no position has been associated with the file, return NULL_POSITION. - */ - public void -get_pos(ifile, scrpos) - IFILE ifile; - struct scrpos *scrpos; -{ - *scrpos = int_ifile(ifile)->h_scrpos; -} - -/* - * Mark the ifile as "opened". - */ - public void -set_open(ifile) - IFILE ifile; -{ - int_ifile(ifile)->h_opened = 1; -} - -/* - * Return whether the ifile has been opened previously. - */ - public int -opened(ifile) - IFILE ifile; -{ - return (int_ifile(ifile)->h_opened); -} - - public void -hold_ifile(ifile, incr) - IFILE ifile; - int incr; -{ - int_ifile(ifile)->h_hold += incr; -} - - public int -held_ifile(ifile) - IFILE ifile; -{ - return (int_ifile(ifile)->h_hold); -} - - public void * -get_filestate(ifile) - IFILE ifile; -{ - return (int_ifile(ifile)->h_filestate); -} - - public void -set_filestate(ifile, filestate) - IFILE ifile; - void *filestate; -{ - int_ifile(ifile)->h_filestate = filestate; -} - -#if 0 - public void -if_dump() -{ - register struct ifile *p; - - for (p = anchor.h_next; p != &anchor; p = p->h_next) - { - printf("%x: %d. <%s> pos %d,%x\n", - p, p->h_index, p->h_filename, - p->h_scrpos.ln, p->h_scrpos.pos); - ch_dump(p->h_filestate); - } -} -#endif |