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libbb: introduce and use xasprintf_inplace()

Browse source 
function                                             old     new   delta
xasprintf_and_free                                     -      49     +49
watch_main                                           269     282     +13
singlemount                                         1313    1315      +2
append_mount_options                                 157     149      -8
ip_port_str                                          122     112     -10
lsblk_main                                           869     858     -11
add_cmd                                             1178    1167     -11
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 2/4 up/down: 64/-40)             Total: 24 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2026-02-05 13:36:27 +01:00
parent 3d572a8cc3
commit fddd93edbd
9 changed files with 48 additions and 34 deletions
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5
editors/sed.c
View file

@ -657,9 +657,8 @@ static void add_cmd(const char *cmdstr)
/* Append this line to any unfinished line from last time. */
if (G.add_cmd_line) {
char *tp = xasprintf("%s\n%s", G.add_cmd_line, cmdstr);
free(G.add_cmd_line);
cmdstr = G.add_cmd_line = tp;
cmdstr = xasprintf_inplace(G.add_cmd_line,
"%s\n%s", G.add_cmd_line, cmdstr);
}
/* If this line ends with unescaped backslash, request next line. */

2
include/libbb.h
View file

@ -950,6 +950,8 @@ int bb_putchar(int ch) FAST_FUNC;
int bb_putchar_stderr(char ch) FAST_FUNC;
int fputs_stdout(const char *s) FAST_FUNC;
char *xasprintf(const char *format, ...) __attribute__ ((format(printf, 1, 2))) FAST_FUNC RETURNS_MALLOC;
char *xasprintf_and_free(char *allocated, const char *format, ...) __attribute__ ((format(printf, 2, 3))) FAST_FUNC RETURNS_MALLOC;
#define xasprintf_inplace(allocated, ...) ((allocated) = xasprintf_and_free((allocated), __VA_ARGS__))
char *auto_string(char *str) FAST_FUNC;
// gcc-4.1.1 still isn't good enough at optimizing it
// (+200 bytes compared to macro)

16
libbb/xfuncs_printf.c
View file

@ -349,6 +349,22 @@ char* FAST_FUNC xasprintf(const char *format, ...)
return string_ptr;
}
char* FAST_FUNC xasprintf_and_free(char *allocated, const char *format, ...)
{
va_list p;
int r;
char *string_ptr;
va_start(p, format);
r = vasprintf(&string_ptr, format, p);
va_end(p);
if (r < 0)
bb_die_memory_exhausted();
free(allocated);
return string_ptr;
}
void FAST_FUNC xsetenv(const char *key, const char *value)
{
if (setenv(key, value, 1))

4
modutils/modprobe-small.c
View file

@ -1010,9 +1010,7 @@ int modprobe_main(int argc UNUSED_PARAM, char **argv)
char **arg = argv;
while (*++arg) {
/* Enclose options in quotes */
char *s = options;
options = xasprintf("%s \"%s\"", s ? s : "", *arg);
free(s);
xasprintf_inplace(options, "%s \"%s\"", options ? options : "", *arg);
*arg = NULL;
}
# else

5
networking/ifupdown.c
View file

@ -895,16 +895,15 @@ static struct interfaces_file_t *read_interfaces(const char *filename, struct in
while ((buf = xmalloc_fgetline(f)) != NULL) {
#if ENABLE_DESKTOP
/* Trailing "\" concatenates lines */
//TODO: check how to handle "line\\" (double backslashes)
char *p;
while ((p = last_char_is(buf, '\\')) != NULL) {
*p = '\0';
rest_of_line = xmalloc_fgetline(f);
if (!rest_of_line)
break;
p = xasprintf("%s%s", buf, rest_of_line);
free(buf);
xasprintf_inplace(buf, "%s%s", buf, rest_of_line);
free(rest_of_line);
buf = p;
}
#endif
rest_of_line = buf;

7
networking/netstat.c
View file

@ -391,7 +391,7 @@ static const char *get_sname(int port, const char *proto, int numeric)
static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int numeric)
{
char *host, *host_port;
char *host;
/* Code which used "*" for INADDR_ANY is removed: it's ambiguous
* in IPv6, while "0.0.0.0" is not. */
@ -402,9 +402,8 @@ static char *ip_port_str(struct sockaddr *addr, int port, const char *proto, int
if (!host)
host = xmalloc_sockaddr2dotted_noport(addr);
host_port = xasprintf("%s:%s", host, get_sname(htons(port), proto, numeric));
free(host);
return host_port;
xasprintf_inplace(host, "%s:%s", host, get_sname(htons(port), proto, numeric));
return host;
}
struct inet_params {

7
procps/watch.c
View file

@ -76,12 +76,9 @@ int watch_main(int argc UNUSED_PARAM, char **argv)
// watch ls -l "a /tmp" "2>&1" - ls won't see "a /tmp" as one param.
argv0 = argv;
// If -x, cmd is only used for printing header
cmd = *argv;
cmd = xstrdup(*argv);
while (*++argv)
cmd = xasprintf("%s %s", cmd, *argv);
//leaks cmd ^^^
//TODO: create and use xasprintf_inplace(DST, fmt, args_one_of_which_is_DST)
//which frees old DST?
xasprintf_inplace(cmd, "%s %s", cmd, *argv);
if (opt & (1 << 3))
argv = argv0; // If -x, restore argv[0] to !NULL

11
util-linux/lsblk.c
View file

@ -101,10 +101,10 @@ static char *get_mountpoints(const char *majmin)
mountpoints = NULL;
len = strlen(majmin);
p = G.mountinfo; // "/proc/self/mountinfo"
p = G.mountinfo; // contents of "/proc/self/mountinfo"
/* lines a-la "63 1 259:3 / /MNTPOINT per-mount_options - ext4 /dev/NAME per-superblock_options" */
while (*p) {
char *e, *f;
char *e;
p = skip_non_whitespace(p);
if (*p != ' ') break;
@ -127,12 +127,11 @@ static char *get_mountpoints(const char *majmin)
// at " /MNTPOINT"
e = skip_non_whitespace(p + 1);
// e is at the end of " /MNTPOINT"
f = mountpoints;
// NO. We return " /MNT1 /MNT2 /MNT3" _with_ leading space!
// if (!f)
// if (!mountpoints)
// p++;
mountpoints = xasprintf("%s%.*s", f ? f : "", (int)(e - p), p);
free(f);
xasprintf_inplace(mountpoints, "%s%.*s",
mountpoints ? mountpoints : "", (int)(e - p), p);
}
return mountpoints;
}

25
util-linux/mount.c
View file

@ -556,27 +556,33 @@ static int verbose_mount(const char *source, const char *target,
#endif
// Append mount options to string
// ("merge two comma-separated lists" is a good candidate for libbb!)
static void append_mount_options(char **oldopts, const char *newopts)
{
if (*oldopts && **oldopts) {
//TODO: do this unconditionally?
//this way, newopts of "opt1,opt2,opt1"
//will be de-duped into "opt1,opt2" in _both_ cases
//(whether or now old opts are empty)
//the only modification needed is to not prepend extra comma
//when old opts is "".
// Do not insert options which are already there
while (newopts[0]) {
while (*newopts) {
char *p;
int len;
//if (*newopts == ',') { newopts++; continue; }
len = strchrnul(newopts, ',') - newopts;
p = *oldopts;
while (1) {
if (!strncmp(p, newopts, len)
if (strncmp(p, newopts, len) == 0
&& (p[len] == ',' || p[len] == '\0'))
goto skip;
p = strchr(p,',');
p = strchr(p, ',');
if (!p) break;
p++;
}
p = xasprintf("%s,%.*s", *oldopts, len, newopts);
free(*oldopts);
*oldopts = p;
xasprintf_inplace(*oldopts, "%s,%.*s", *oldopts, len, newopts);
skip:
newopts += len;
while (*newopts == ',') newopts++;
@ -2065,12 +2071,11 @@ static int singlemount(struct mntent *mp, int ignore_busy)
if (!is_prefixed_with(filteropts, ",ip="+1)
&& !strstr(filteropts, ",ip=")
) {
char *dotted, *ip;
char *ip;
// Insert "ip=..." option into options
dotted = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
ip = xmalloc_sockaddr2dotted_noport(&lsa->u.sa);
if (ENABLE_FEATURE_CLEAN_UP) free(lsa);
ip = xasprintf("ip=%s", dotted);
if (ENABLE_FEATURE_CLEAN_UP) free(dotted);
xasprintf_inplace(ip, "ip=%s", ip);
// Note: IPv6 scoped addresses ("host%iface", see RFC 4007) should be
// handled by libc in getnameinfo() (inside xmalloc_sockaddr2dotted_noport()).
// Currently, glibc does not support that (has no NI_NUMERICSCOPE),