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nfv?asprintf are broken without va_copy, workaround them.

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* drop nfasprintf.
* move nfvasprintf into imap-send.c back, and let it work on a 8k buffer,
  and die() in case of overflow. It should be enough for imap commands, if
  someone cares about imap-send, he's welcomed to fix it properly.
* replace nfvasprintf use in merge-recursive with a copy of the strbuf_addf
  logic, it's one place, we'll live with it.
  To ease the change, output_buffer string list is replaced with a strbuf ;)
* rework trace.c to call vsnprintf itself.  It's used to format strerror()s
  and git command names, it should never be more than a few octets long, let
  it work on a 8k static buffer with vsnprintf or die loudly.

Signed-off-by: Pierre Habouzit <madcoder@debian.org>
This commit is contained in:
Pierre Habouzit 2007-09-20 10:43:11 +02:00 committed by Junio C Hamano
parent e03e05ff73
commit 19247e5510
4 changed files with 78 additions and 108 deletions
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2
cache.h
View File

@ -585,8 +585,6 @@ extern void *alloc_object_node(void);
extern void alloc_report(void);
/* trace.c */
extern int nfasprintf(char **str, const char *fmt, ...);
extern int nfvasprintf(char **str, const char *fmt, va_list va);
extern void trace_printf(const char *format, ...);
extern void trace_argv_printf(const char **argv, int count, const char *format, ...);

13
imap-send.c
View File

@ -105,6 +105,19 @@ static void free_generic_messages( message_t * );
static int nfsnprintf( char *buf, int blen, const char *fmt, ... );
static int nfvasprintf(char **strp, const char *fmt, va_list ap)
{
int len;
char tmp[8192];
len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
if (len < 0)
die("Fatal: Out of memory\n");
if (len >= sizeof(tmp))
die("imap command overflow !\n");
*strp = xmemdupz(tmp, len);
return len;
}
static void arc4_init( void );
static unsigned char arc4_getbyte( void );

81
merge-recursive.c
View File

@ -85,63 +85,58 @@ struct stage_data
unsigned processed:1;
};
struct output_buffer
{
struct output_buffer *next;
char *str;
};
static struct path_list current_file_set = {NULL, 0, 0, 1};
static struct path_list current_directory_set = {NULL, 0, 0, 1};
static int call_depth = 0;
static int verbosity = 2;
static int buffer_output = 1;
static struct output_buffer *output_list, *output_end;
static struct strbuf obuf = STRBUF_INIT;
static int show (int v)
static int show(int v)
{
return (!call_depth && verbosity >= v) || verbosity >= 5;
}
static void output(int v, const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
if (buffer_output && show(v)) {
struct output_buffer *b = xmalloc(sizeof(*b));
nfvasprintf(&b->str, fmt, args);
b->next = NULL;
if (output_end)
output_end->next = b;
else
output_list = b;
output_end = b;
} else if (show(v)) {
int i;
for (i = call_depth; i--;)
fputs(" ", stdout);
vfprintf(stdout, fmt, args);
fputc('\n', stdout);
}
va_end(args);
}
static void flush_output(void)
{
struct output_buffer *b, *n;
for (b = output_list; b; b = n) {
int i;
for (i = call_depth; i--;)
fputs(" ", stdout);
fputs(b->str, stdout);
fputc('\n', stdout);
n = b->next;
free(b->str);
free(b);
if (obuf.len) {
fputs(obuf.buf, stdout);
strbuf_reset(&obuf);
}
output_list = NULL;
output_end = NULL;
}
static void output(int v, const char *fmt, ...)
{
int len;
va_list ap;
if (!show(v))
return;
strbuf_grow(&obuf, call_depth * 2 + 2);
memset(obuf.buf + obuf.len, ' ', call_depth * 2);
strbuf_setlen(&obuf, obuf.len + call_depth * 2);
va_start(ap, fmt);
len = vsnprintf(obuf.buf + obuf.len, strbuf_avail(&obuf), fmt, ap);
va_end(ap);
if (len < 0)
len = 0;
if (len >= strbuf_avail(&obuf)) {
strbuf_grow(&obuf, len + 2);
va_start(ap, fmt);
len = vsnprintf(obuf.buf + obuf.len, strbuf_avail(&obuf), fmt, ap);
va_end(ap);
if (len >= strbuf_avail(&obuf)) {
die("this should not happen, your snprintf is broken");
}
}
strbuf_setlen(&obuf, obuf.len + len);
strbuf_add(&obuf, "\n", 1);
if (!buffer_output)
flush_output();
}
static void output_commit_title(struct commit *commit)

90
trace.c
View File

@ -25,33 +25,6 @@
#include "cache.h"
#include "quote.h"
/* Stolen from "imap-send.c". */
int nfvasprintf(char **strp, const char *fmt, va_list ap)
{
int len;
char tmp[1024];
if ((len = vsnprintf(tmp, sizeof(tmp), fmt, ap)) < 0 ||
!(*strp = xmalloc(len + 1)))
die("Fatal: Out of memory\n");
if (len >= (int)sizeof(tmp))
vsprintf(*strp, fmt, ap);
else
memcpy(*strp, tmp, len + 1);
return len;
}
int nfasprintf(char **str, const char *fmt, ...)
{
int rc;
va_list args;
va_start(args, fmt);
rc = nfvasprintf(str, fmt, args);
va_end(args);
return rc;
}
/* Get a trace file descriptor from GIT_TRACE env variable. */
static int get_trace_fd(int *need_close)
{
@ -89,63 +62,54 @@ static int get_trace_fd(int *need_close)
static const char err_msg[] = "Could not trace into fd given by "
"GIT_TRACE environment variable";
void trace_printf(const char *format, ...)
void trace_printf(const char *fmt, ...)
{
char *trace_str;
va_list rest;
int need_close = 0;
int fd = get_trace_fd(&need_close);
char buf[8192];
va_list ap;
int fd, len, need_close = 0;
fd = get_trace_fd(&need_close);
if (!fd)
return;
va_start(rest, format);
nfvasprintf(&trace_str, format, rest);
va_end(rest);
write_or_whine_pipe(fd, trace_str, strlen(trace_str), err_msg);
free(trace_str);
va_start(ap, fmt);
len = vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (len >= sizeof(buf))
die("unreasonnable trace length");
write_or_whine_pipe(fd, buf, len, err_msg);
if (need_close)
close(fd);
}
void trace_argv_printf(const char **argv, int count, const char *format, ...)
void trace_argv_printf(const char **argv, int count, const char *fmt, ...)
{
char *argv_str, *format_str, *trace_str;
size_t argv_len, format_len, trace_len;
va_list rest;
int need_close = 0;
int fd = get_trace_fd(&need_close);
char buf[8192];
va_list ap;
char *argv_str;
size_t argv_len;
int fd, len, need_close = 0;
fd = get_trace_fd(&need_close);
if (!fd)
return;
va_start(ap, fmt);
len = vsnprintf(buf, sizeof(buf), fmt, ap);
va_end(ap);
if (len >= sizeof(buf))
die("unreasonnable trace length");
/* Get the argv string. */
argv_str = sq_quote_argv(argv, count);
argv_len = strlen(argv_str);
/* Get the formated string. */
va_start(rest, format);
nfvasprintf(&format_str, format, rest);
va_end(rest);
/* Allocate buffer for trace string. */
format_len = strlen(format_str);
trace_len = argv_len + format_len + 1; /* + 1 for \n */
trace_str = xmalloc(trace_len + 1);
/* Copy everything into the trace string. */
strncpy(trace_str, format_str, format_len);
strncpy(trace_str + format_len, argv_str, argv_len);
strcpy(trace_str + trace_len - 1, "\n");
write_or_whine_pipe(fd, trace_str, trace_len, err_msg);
write_or_whine_pipe(fd, buf, len, err_msg);
write_or_whine_pipe(fd, argv_str, argv_len, err_msg);
write_or_whine_pipe(fd, "\n", 1, err_msg);
free(argv_str);
free(format_str);
free(trace_str);
if (need_close)
close(fd);