[PATCH 2/5] sq_quote_argv and add_to_string rework with strbuf's.
* sq_quote_buf is made public, and works on a strbuf.
* sq_quote_argv also works on a strbuf.
* make sq_quote_argv take a "maxlen" argument to check the buffer won't grow
too big.
Signed-off-by: Pierre Habouzit <madcoder@debian.org>
---
connect.c | 21 ++++++--------
git.c | 16 +++-------
quote.c | 91 ++++++++++++++++---------------------------------------------
quote.h | 9 ++----
rsh.c | 33 ++++++----------------
trace.c | 35 +++++++-----------------
6 files changed, 60 insertions(+), 145 deletions(-)
diff --git a/connect.c b/connect.c
index 1653a0e..06d279e 100644
--- a/connect.c
+++ b/connect.c
@@ -577,16 +577,13 @@ pid_t git_connect(int fd[2], char *url, const char *prog, int flags)
if (pid < 0)
die("unable to fork");
if (!pid) {
- char command[MAX_CMD_LEN];
- char *posn = command;
- int size = MAX_CMD_LEN;
- int of = 0;
+ struct strbuf cmd;
- of |= add_to_string(&posn, &size, prog, 0);
- of |= add_to_string(&posn, &size, " ", 0);
- of |= add_to_string(&posn, &size, path, 1);
-
- if (of)
+ strbuf_init(&cmd, MAX_CMD_LEN);
+ strbuf_addstr(&cmd, prog);
+ strbuf_addch(&cmd, ' ');
+ sq_quote_buf(&cmd, path);
+ if (cmd.len >= MAX_CMD_LEN)
die("command line too long");
dup2(pipefd[1][0], 0);
@@ -606,10 +603,10 @@ pid_t git_connect(int fd[2], char *url, const char *prog, int flags)
ssh_basename++;
if (!port)
- execlp(ssh, ssh_basename, host, command, NULL);
+ execlp(ssh, ssh_basename, host, cmd.buf, NULL);
else
execlp(ssh, ssh_basename, "-p", port, host,
- command, NULL);
+ cmd.buf, NULL);
}
else {
unsetenv(ALTERNATE_DB_ENVIRONMENT);
@@ -618,7 +615,7 @@ pid_t git_connect(int fd[2], char *url, const char *prog, int flags)
unsetenv(GIT_WORK_TREE_ENVIRONMENT);
unsetenv(GRAFT_ENVIRONMENT);
unsetenv(INDEX_ENVIRONMENT);
- execlp("sh", "sh", "-c", command, NULL);
+ execlp("sh", "sh", "-c", cmd.buf, NULL);
}
die("exec failed");
}
diff --git a/git.c b/git.c
index 56ae8cc..9eaca1d 100644
--- a/git.c
+++ b/git.c
@@ -187,19 +187,13 @@ static int handle_alias(int *argcp, const char ***argv)
if (alias_string) {
if (alias_string[0] == '!') {
if (*argcp > 1) {
- int i, sz = PATH_MAX;
- char *s = xmalloc(sz), *new_alias = s;
+ struct strbuf buf;
- add_to_string(&s, &sz, alias_string, 0);
+ strbuf_init(&buf, PATH_MAX);
+ strbuf_addstr(&buf, alias_string);
+ sq_quote_argv(&buf, (*argv) + 1, *argcp - 1, PATH_MAX);
free(alias_string);
- alias_string = new_alias;
- for (i = 1; i < *argcp &&
- !add_to_string(&s, &sz, " ", 0) &&
- !add_to_string(&s, &sz, (*argv)[i], 1)
- ; i++)
- ; /* do nothing */
- if (!sz)
- die("Too many or long arguments");
+ alias_string = buf.buf;
}
trace_printf("trace: alias to shell cmd: %s => %s\n",
alias_command, alias_string + 1);
diff --git a/quote.c b/quote.c
index d88bf75..4df3262 100644
--- a/quote.c
+++ b/quote.c
@@ -20,29 +20,26 @@ static inline int need_bs_quote(char c)
return (c == '\'' || c == '!');
}
-static size_t sq_quote_buf(char *dst, size_t n, const char *src)
+void sq_quote_buf(struct strbuf *dst, const char *src)
{
- char c;
- char *bp = dst;
- size_t len = 0;
-
- EMIT('\'');
- while ((c = *src++)) {
- if (need_bs_quote(c)) {
- EMIT('\'');
- EMIT('\\');
- EMIT(c);
- EMIT('\'');
- } else {
- EMIT(c);
+ char *to_free = NULL;
+
+ if (dst->buf == src)
+ to_free = strbuf_detach(dst);
+
+ strbuf_addch(dst, '\'');
+ while (*src) {
+ size_t len = strcspn(src, "'\\");
+ strbuf_add(dst, src, len);
+ src += len;
+ while (need_bs_quote(*src)) {
+ strbuf_addstr(dst, "'\\");
+ strbuf_addch(dst, *src++);
+ strbuf_addch(dst, '\'');
}
}
- EMIT('\'');
-
- if ( n )
- *bp = 0;
-
- return len;
+ strbuf_addch(dst, '\'');
+ free(to_free);
}
void sq_quote_print(FILE *stream, const char *src)
@@ -62,11 +59,10 @@ void sq_quote_print(FILE *stream, const char *src)
fputc('\'', stream);
}
-char *sq_quote_argv(const char** argv, int count)
+void sq_quote_argv(struct strbuf *dst, const char** argv, int count,
+ size_t maxlen)
{
- char *buf, *to;
int i;
- size_t len = 0;
/* Count argv if needed. */
if (count < 0) {
@@ -74,53 +70,14 @@ char *sq_quote_argv(const char** argv, int count)
; /* just counting */
}
- /* Special case: no argv. */
- if (!count)
- return xcalloc(1,1);
-
- /* Get destination buffer length. */
- for (i = 0; i < count; i++)
- len += sq_quote_buf(NULL, 0, argv[i]) + 1;
-
- /* Alloc destination buffer. */
- to = buf = xmalloc(len + 1);
-
/* Copy into destination buffer. */
+ strbuf_grow(dst, 32 * count);
for (i = 0; i < count; ++i) {
- *to++ = ' ';
- to += sq_quote_buf(to, len, argv[i]);
+ strbuf_addch(dst, ' ');
+ sq_quote_buf(dst, argv[i]);
+ if (maxlen && dst->len > maxlen)
+ die("Too many or long arguments");
}
-
- return buf;
-}
-
-/*
- * Append a string to a string buffer, with or without shell quoting.
- * Return true if the buffer overflowed.
- */
-int add_to_string(char **ptrp, int *sizep, const char *str, int quote)
-{
- char *p = *ptrp;
- int size = *sizep;
- int oc;
- int err = 0;
-
- if (quote)
- oc = sq_quote_buf(p, size, str);
- else {
- oc = strlen(str);
- memcpy(p, str, (size <= oc) ? size - 1 : oc);
- }
-
- if (size <= oc) {
- err = 1;
- oc = size - 1;
- }
-
- *ptrp += oc;
- **ptrp = '\0';
- *sizep -= oc;
- return err;
}
char *sq_dequote(char *arg)
diff --git a/quote.h b/quote.h
index 8a59cc5..78e8d3e 100644
--- a/quote.h
+++ b/quote.h
@@ -29,13 +29,10 @@
*/
extern void sq_quote_print(FILE *stream, const char *src);
-extern char *sq_quote_argv(const char** argv, int count);
-/*
- * Append a string to a string buffer, with or without shell quoting.
- * Return true if the buffer overflowed.
- */
-extern int add_to_string(char **ptrp, int *sizep, const char *str, int quote);
+extern void sq_quote_buf(struct strbuf *, const char *src);
+extern void sq_quote_argv(struct strbuf *, const char **argv, int count,
+ size_t maxlen);
/* This unwraps what sq_quote() produces in place, but returns
* NULL if the input does not look like what sq_quote would have
diff --git a/rsh.c b/rsh.c
index 5754a23..e4ce255 100644
--- a/rsh.c
+++ b/rsh.c
@@ -7,14 +7,10 @@
int setup_connection(int *fd_in, int *fd_out, const char *remote_prog,
char *url, int rmt_argc, char **rmt_argv)
{
+ struct strbuf cmd;
char *host;
char *path;
int sv[2];
- char command[COMMAND_SIZE];
- char *posn;
- int sizen;
- int of;
- int i;
pid_t pid;
if (!strcmp(url, "-")) {
@@ -37,24 +33,13 @@ int setup_connection(int *fd_in, int *fd_out, const char *remote_prog,
return error("Bad URL: %s", url);
}
/* $GIT_RSH <host> "env GIT_DIR=<path> <remote_prog> <args...>" */
- sizen = COMMAND_SIZE;
- posn = command;
- of = 0;
- of |= add_to_string(&posn, &sizen, "env ", 0);
- of |= add_to_string(&posn, &sizen, GIT_DIR_ENVIRONMENT "=", 0);
- of |= add_to_string(&posn, &sizen, path, 1);
- of |= add_to_string(&posn, &sizen, " ", 0);
- of |= add_to_string(&posn, &sizen, remote_prog, 1);
-
- for ( i = 0 ; i < rmt_argc ; i++ ) {
- of |= add_to_string(&posn, &sizen, " ", 0);
- of |= add_to_string(&posn, &sizen, rmt_argv[i], 1);
- }
-
- of |= add_to_string(&posn, &sizen, " -", 0);
-
- if ( of )
- return error("Command line too long");
+ strbuf_init(&cmd, COMMAND_SIZE);
+ strbuf_addstr(&cmd, "env " GIT_DIR_ENVIRONMENT "=");
+ sq_quote_buf(&cmd, path);
+ strbuf_addch(&cmd, ' ');
+ sq_quote_buf(&cmd, remote_prog);
+ sq_quote_argv(&cmd, (const char **)rmt_argv, rmt_argc, COMMAND_SIZE - 2);
+ strbuf_addstr(&cmd, " -");
if (socketpair(AF_UNIX, SOCK_STREAM, 0, sv))
return error("Couldn't create socket");
@@ -74,7 +59,7 @@ int setup_connection(int *fd_in, int *fd_out, const char *remote_prog,
close(sv[1]);
dup2(sv[0], 0);
dup2(sv[0], 1);
- execlp(ssh, ssh_basename, host, command, NULL);
+ execlp(ssh, ssh_basename, host, cmd.buf, NULL);
}
close(sv[0]);
*fd_in = sv[1];
diff --git a/trace.c b/trace.c
index 7961a27..ed1cdf0 100644
--- a/trace.c
+++ b/trace.c
@@ -113,39 +113,24 @@ void trace_printf(const char *format, ...)
void trace_argv_printf(const char **argv, int count, const char *format, ...)
{
- char *argv_str, *format_str, *trace_str;
- size_t argv_len, format_len, trace_len;
- va_list rest;
+ struct strbuf trace;
+ va_list ap;
int need_close = 0;
int fd = get_trace_fd(&need_close);
if (!fd)
return;
- /* 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);
+ strbuf_init(&trace, 0);
- /* 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);
+ va_start(ap, format);
+ strbuf_addvf(&trace, format, ap);
+ va_end(ap);
+ sq_quote_argv(&trace, argv, count, 0);
+ strbuf_addch(&trace, '\n');
- /* 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);
-
- free(argv_str);
- free(format_str);
- free(trace_str);
+ write_or_whine_pipe(fd, trace.buf, trace.len, err_msg);
+ strbuf_release(&trace);
if (need_close)
close(fd);
--
1.5.3.1
Pierre Habouzit <madcoder@debian.org>