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patch: fixes to use plan a (too) by Gautam Tirumala.

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This commit is contained in:
Ben Gras 2010-07-19 10:40:48 +00:00
parent 34dd221af7
commit 6ce51040a2
1 changed files with 42 additions and 10 deletions
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52
commands/patch/inp.c
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@ -58,9 +58,7 @@
static off_t i_size; /* size of the input file */
static char *i_womp; /* plan a buffer for entire file */
static char **i_ptr; /* pointers to lines in i_womp */
#if 0
static char empty_line[] = { '\0' };
#endif
static int tifd = -1; /* plan b virtual string array */
static char *tibuf[2]; /* plan b buffers */
@ -69,15 +67,31 @@ static LINENUM lines_per_buf; /* how many lines per buffer */
static int tireclen; /* length of records in tmp file */
static bool rev_in_string(const char *);
#if 0
static bool reallocate_lines(size_t *);
#endif
/* returns false if insufficient memory */
static bool plan_a(const char *);
static void plan_b(const char *);
static int readfile(int fd, char *buf, size_t s)
{
int ntoread, nread;
ntoread = s;
nread = 0;
while(ntoread > 0) {
if((nread = read(fd, buf, ntoread)) < 0) {
return nread;
}
buf += nread;
ntoread -= nread;
}
return 0;
}
/* New patch--prepare to edit another file. */
void
@ -116,7 +130,6 @@ scan_input(const char *filename)
}
}
#if 0
static bool
reallocate_lines(size_t *lines_allocated)
{
@ -137,16 +150,12 @@ reallocate_lines(size_t *lines_allocated)
i_ptr = p;
return true;
}
#endif
/* Try keeping everything in memory. */
static bool
plan_a(const char *filename)
{
#ifdef __minix
return false;
#else
int ifd, statfailed;
char *p, *s, lbuf[MAXLINELEN];
struct stat filestat;
@ -262,13 +271,16 @@ plan_a(const char *filename)
out_of_mem = false;
return false; /* force plan b because plan a bombed */
}
#ifndef __minix
if (i_size > SIZE_MAX) {
say("block too large to mmap\n");
return false;
}
#endif
if ((ifd = open(filename, O_RDONLY)) < 0)
pfatal("can't open file %s", filename);
#ifndef __minix
i_womp = mmap(NULL, i_size, PROT_READ, MAP_PRIVATE, ifd, 0);
if (i_womp == MAP_FAILED) {
perror("mmap failed");
@ -276,10 +288,27 @@ plan_a(const char *filename)
close(ifd);
return false;
}
#else
i_womp = malloc(i_size);
if(i_size && i_womp == NULL) {
fprintf(stderr, "Malloc failed.\n");
i_womp = NULL;
close(ifd);
return false;
}
if(readfile(ifd, i_womp, i_size) < 0) {
perror("Readfile failed.");
i_womp = NULL;
close(ifd);
return false;
}
#endif
close(ifd);
#ifndef __minix
if (i_size)
madvise(i_womp, i_size, MADV_SEQUENTIAL);
#endif
/* estimate the number of lines */
lines_allocated = i_size / 25;
@ -312,7 +341,11 @@ plan_a(const char *filename)
if (p == NULL) {
free(i_ptr);
i_ptr = NULL;
#ifndef __minix
munmap(i_womp, i_size);
#else
free(i_womp);
#endif
i_womp = NULL;
return false;
}
@ -352,7 +385,6 @@ plan_a(const char *filename)
revision);
}
return true; /* plan a will work */
#endif
}
/* Keep (virtually) nothing in memory. */