update and reformat some comments in the history code
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tg
parent
b3f4c69f05
commit
44a27fa8e0
111
histrap.c
111
histrap.c
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@ -26,7 +26,7 @@
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#include <sys/file.h>
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#endif
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__RCSID("$MirOS: src/bin/mksh/histrap.c,v 1.111 2011/09/07 15:24:16 tg Exp $");
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__RCSID("$MirOS: src/bin/mksh/histrap.c,v 1.112 2011/11/26 18:19:00 tg Exp $");
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/*-
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* MirOS: This is the default mapping type, and need not be specified.
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@ -527,8 +527,7 @@ findhist(int start, int fwd, const char *str, int anchored)
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}
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/*
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* set history
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* this means reallocating the dataspace
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* set history; this means reallocating the dataspace
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*/
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void
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sethistsize(int n)
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@ -551,9 +550,8 @@ sethistsize(int n)
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#if HAVE_PERSISTENT_HISTORY
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/*
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* set history file
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* This can mean reloading/resetting/starting history file
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* maintenance
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* set history file; this can mean reloading/resetting/starting
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* history file maintenance
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*/
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void
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sethistfile(const char *name)
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@ -567,7 +565,7 @@ sethistfile(const char *name)
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return;
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/*
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* its a new name - possibly
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* it's a new name - possibly
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*/
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if (histfd) {
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/* yes the file is open */
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@ -586,7 +584,7 @@ sethistfile(const char *name)
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#endif
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/*
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* initialise the history vector
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* initialise the history vector
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*/
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void
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init_histvec(void)
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@ -600,11 +598,7 @@ init_histvec(void)
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/*
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* Routines added by Peter Collinson BSDI(Europe)/Hillside Systems to
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* a) permit HISTSIZE to control number of lines of history stored
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* b) maintain a physical history file
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*
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* It turns out that there is a lot of ghastly hackery here
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* It turns out that there is a lot of ghastly hackery here
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*/
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#if !defined(MKSH_SMALL) && HAVE_PERSISTENT_HISTORY
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@ -670,25 +664,23 @@ histsave(int *lnp, const char *cmd, bool dowrite MKSH_A_UNUSED, bool ignoredups)
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}
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/*
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* Write history data to a file nominated by HISTFILE
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* if HISTFILE is unset then history still happens, but
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* the data is not written to a file
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* All copies of ksh looking at the file will maintain the
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* same history. This is ksh behaviour.
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* Write history data to a file nominated by HISTFILE;
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* if HISTFILE is unset then history still happens, but
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* the data is not written to a file. All copies of ksh
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* looking at the file will maintain the same history.
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* This is ksh behaviour.
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*
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* This stuff uses mmap()
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* if your system ain't got it - then you'll have to undef HISTORYFILE
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* This stuff uses mmap()
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*/
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/*-
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* Open a history file
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* Format is:
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* Bytes 1, 2:
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* HMAGIC - just to check that we are dealing with
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* the correct object
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* Then follows a number of stored commands
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* Each command is
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* <command byte><command number(4 bytes)><bytes><null>
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* Open a history file
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* Format is:
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* Bytes 1, 2:
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* HMAGIC - just to check that we are dealing with the correct object
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* Then follows a number of stored commands
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* Each command is
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* <command byte><command number(4 bytes)><bytes><NUL>
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*/
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#define HMAGIC1 0xab
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#define HMAGIC2 0xcd
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@ -787,10 +779,12 @@ hist_init(Source *s)
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#if HAVE_PERSISTENT_HISTORY
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typedef enum state {
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shdr, /* expecting a header */
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sline, /* looking for a null byte to end the line */
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sn1, /* bytes 1 to 4 of a line no */
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sn2, sn3, sn4
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/* expecting a header */
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shdr,
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/* looking for a NUL byte to end the line */
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sline,
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/* bytes 1 to 4 of a line number */
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sn1, sn2, sn3, sn4
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} State;
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static int
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@ -825,7 +819,7 @@ hist_count_lines(unsigned char *base, int bytes)
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}
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/*
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* Shrink the history file to histsize lines
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* Shrink the history file to HISTSIZE lines
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*/
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static int
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hist_shrink(unsigned char *oldbase, int oldbytes)
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@ -843,7 +837,7 @@ hist_shrink(unsigned char *oldbase, int oldbytes)
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return (0);
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/*
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* create temp file
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* create temp file
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*/
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nfile = shf_smprintf("%s.%d", hname, (int)procpid);
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if ((fd = open(nfile, O_CREAT | O_TRUNC | O_WRONLY, 0600)) < 0)
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@ -858,7 +852,7 @@ hist_shrink(unsigned char *oldbase, int oldbytes)
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fd = -1;
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/*
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* rename
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* rename
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*/
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if (rename(nfile, hname) < 0) {
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errout:
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@ -874,8 +868,8 @@ hist_shrink(unsigned char *oldbase, int oldbytes)
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}
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/*
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* find a pointer to the data 'no' back from the end of the file
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* return the pointer and the number of bytes left
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* find a pointer to the data 'no' back from the end of the file;
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* return the pointer and the number of bytes left
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*/
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static unsigned char *
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hist_skip_back(unsigned char *base, int *bytes, int no)
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@ -887,7 +881,7 @@ hist_skip_back(unsigned char *base, int *bytes, int no)
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/*
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* this doesn't really work: the 4 byte line number that
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* is encoded after the COMMAND byte can itself contain
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* the COMMAND byte....
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* the COMMAND byte...
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*/
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for (; ep > base && *ep != COMMAND; ep--)
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;
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@ -902,7 +896,7 @@ hist_skip_back(unsigned char *base, int *bytes, int no)
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}
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/*
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* load the history structure from the stored data
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* load the history structure from the stored data
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*/
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static void
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histload(Source *s, unsigned char *base, int bytes)
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@ -918,27 +912,27 @@ histload(Source *s, unsigned char *base, int bytes)
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state = sn1;
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break;
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case sn1:
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lno = (((*base)&0xff)<<24);
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lno = (((*base) & 0xFF) << 24);
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state = sn2;
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break;
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case sn2:
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lno |= (((*base)&0xff)<<16);
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lno |= (((*base) & 0xFF) << 16);
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state = sn3;
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break;
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case sn3:
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lno |= (((*base)&0xff)<<8);
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lno |= (((*base) & 0xFF) << 8);
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state = sn4;
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break;
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case sn4:
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lno |= (*base)&0xff;
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line = base+1;
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lno |= (*base) & 0xFF;
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line = base + 1;
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state = sline;
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break;
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case sline:
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if (*base == '\0') {
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/* worry about line numbers */
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if (histptr >= history && lno-1 != s->line) {
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/* a replacement ? */
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/* a replacement? */
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histinsert(s, lno, (char *)line);
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} else {
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s->line = lno--;
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@ -952,7 +946,7 @@ histload(Source *s, unsigned char *base, int bytes)
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}
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/*
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* Insert a line into the history at a specified number
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* Insert a line into the history at a specified number
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*/
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static void
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histinsert(Source *s, int lno, const char *line)
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@ -968,11 +962,12 @@ histinsert(Source *s, int lno, const char *line)
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}
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/*
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* write a command to the end of the history file
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* This *MAY* seem easy but it's also necessary to check
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* that the history file has not changed in size.
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* If it has - then some other shell has written to it
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* and we should read those commands to update our history
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* write a command to the end of the history file
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*
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* This *MAY* seem easy but it's also necessary to check
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* that the history file has not changed in size.
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* If it has - then some other shell has written to it and
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* we should (re)read those commands to update our history
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*/
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static void
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writehistfile(int lno, char *cmd)
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@ -985,7 +980,7 @@ writehistfile(int lno, char *cmd)
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sizenow = lseek(histfd, (off_t)0, SEEK_END);
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if ((sizenow <= (1024 * 1048576)) && ((size_t)sizenow != hsize)) {
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/*
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* Things have changed
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* Things have changed
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*/
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if ((size_t)sizenow > hsize) {
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/* someone has added some lines */
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@ -1014,13 +1009,13 @@ writehistfile(int lno, char *cmd)
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}
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if (cmd) {
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/*
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* we can write our bit now
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* we can write our bit now
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*/
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hdr[0] = COMMAND;
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hdr[1] = (lno>>24)&0xff;
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hdr[2] = (lno>>16)&0xff;
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hdr[3] = (lno>>8)&0xff;
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hdr[4] = lno&0xff;
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hdr[1] = (lno >> 24) & 0xFF;
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hdr[2] = (lno >> 16) & 0xFF;
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hdr[3] = (lno >> 8) & 0xFF;
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hdr[4] = lno & 0xFF;
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bytes = strlen(cmd) + 1;
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if ((write(histfd, hdr, 5) != 5) ||
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(write(histfd, cmd, bytes) != bytes))
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@ -1045,7 +1040,7 @@ hist_finish(void)
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}
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/*
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* add magic to the history file
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* add magic to the history file
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*/
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static int
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sprinkle(int fd)
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