mirror of
https://github.com/AuxXxilium/eudev.git
synced 2024-12-25 03:49:00 +07:00
879 lines
20 KiB
C
879 lines
20 KiB
C
/*-*- Mode: C; c-basic-offset: 8 -*-*/
|
|
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
#include <stdlib.h>
|
|
#include <signal.h>
|
|
#include <stdio.h>
|
|
|
|
#include "macro.h"
|
|
#include "util.h"
|
|
|
|
usec_t now(clockid_t clock) {
|
|
struct timespec ts;
|
|
|
|
assert_se(clock_gettime(clock, &ts) == 0);
|
|
|
|
return timespec_load(&ts);
|
|
}
|
|
|
|
usec_t timespec_load(const struct timespec *ts) {
|
|
assert(ts);
|
|
|
|
return
|
|
(usec_t) ts->tv_sec * USEC_PER_SEC +
|
|
(usec_t) ts->tv_nsec / NSEC_PER_USEC;
|
|
}
|
|
|
|
struct timespec *timespec_store(struct timespec *ts, usec_t u) {
|
|
assert(ts);
|
|
|
|
ts->tv_sec = (time_t) (u / USEC_PER_SEC);
|
|
ts->tv_nsec = (long int) ((u % USEC_PER_SEC) * NSEC_PER_USEC);
|
|
|
|
return ts;
|
|
}
|
|
|
|
usec_t timeval_load(const struct timeval *tv) {
|
|
assert(tv);
|
|
|
|
return
|
|
(usec_t) tv->tv_sec * USEC_PER_SEC +
|
|
(usec_t) tv->tv_usec;
|
|
}
|
|
|
|
struct timeval *timeval_store(struct timeval *tv, usec_t u) {
|
|
assert(tv);
|
|
|
|
tv->tv_sec = (time_t) (u / USEC_PER_SEC);
|
|
tv->tv_usec = (suseconds_t) (u % USEC_PER_SEC);
|
|
|
|
return tv;
|
|
}
|
|
|
|
bool endswith(const char *s, const char *postfix) {
|
|
size_t sl, pl;
|
|
|
|
assert(s);
|
|
assert(postfix);
|
|
|
|
sl = strlen(s);
|
|
pl = strlen(postfix);
|
|
|
|
if (sl < pl)
|
|
return false;
|
|
|
|
return memcmp(s + sl - pl, postfix, pl) == 0;
|
|
}
|
|
|
|
bool startswith(const char *s, const char *prefix) {
|
|
size_t sl, pl;
|
|
|
|
assert(s);
|
|
assert(prefix);
|
|
|
|
sl = strlen(s);
|
|
pl = strlen(prefix);
|
|
|
|
if (sl < pl)
|
|
return false;
|
|
|
|
return memcmp(s, prefix, pl) == 0;
|
|
}
|
|
|
|
int close_nointr(int fd) {
|
|
assert(fd >= 0);
|
|
|
|
for (;;) {
|
|
int r;
|
|
|
|
if ((r = close(fd)) >= 0)
|
|
return r;
|
|
|
|
if (errno != EINTR)
|
|
return r;
|
|
}
|
|
}
|
|
|
|
void close_nointr_nofail(int fd) {
|
|
|
|
/* like close_nointr() but cannot fail, and guarantees errno
|
|
* is unchanged */
|
|
|
|
assert_se(close_nointr(fd) == 0);
|
|
}
|
|
|
|
int parse_boolean(const char *v) {
|
|
assert(v);
|
|
|
|
if (streq(v, "1") || v[0] == 'y' || v[0] == 'Y' || v[0] == 't' || v[0] == 'T' || !strcasecmp(v, "on"))
|
|
return 1;
|
|
else if (streq(v, "0") || v[0] == 'n' || v[0] == 'N' || v[0] == 'f' || v[0] == 'F' || !strcasecmp(v, "off"))
|
|
return 0;
|
|
|
|
return -EINVAL;
|
|
}
|
|
|
|
int safe_atou(const char *s, unsigned *ret_u) {
|
|
char *x = NULL;
|
|
unsigned long l;
|
|
|
|
assert(s);
|
|
assert(ret_u);
|
|
|
|
errno = 0;
|
|
l = strtoul(s, &x, 0);
|
|
|
|
if (!x || *x || errno)
|
|
return errno ? -errno : -EINVAL;
|
|
|
|
if ((unsigned long) (unsigned) l != l)
|
|
return -ERANGE;
|
|
|
|
*ret_u = (unsigned) l;
|
|
return 0;
|
|
}
|
|
|
|
int safe_atoi(const char *s, int *ret_i) {
|
|
char *x = NULL;
|
|
long l;
|
|
|
|
assert(s);
|
|
assert(ret_i);
|
|
|
|
errno = 0;
|
|
l = strtol(s, &x, 0);
|
|
|
|
if (!x || *x || errno)
|
|
return errno ? -errno : -EINVAL;
|
|
|
|
if ((long) (int) l != l)
|
|
return -ERANGE;
|
|
|
|
*ret_i = (int) l;
|
|
return 0;
|
|
}
|
|
|
|
int safe_atolu(const char *s, long unsigned *ret_lu) {
|
|
char *x = NULL;
|
|
unsigned long l;
|
|
|
|
assert(s);
|
|
assert(ret_lu);
|
|
|
|
errno = 0;
|
|
l = strtoul(s, &x, 0);
|
|
|
|
if (!x || *x || errno)
|
|
return errno ? -errno : -EINVAL;
|
|
|
|
*ret_lu = l;
|
|
return 0;
|
|
}
|
|
|
|
int safe_atoli(const char *s, long int *ret_li) {
|
|
char *x = NULL;
|
|
long l;
|
|
|
|
assert(s);
|
|
assert(ret_li);
|
|
|
|
errno = 0;
|
|
l = strtol(s, &x, 0);
|
|
|
|
if (!x || *x || errno)
|
|
return errno ? -errno : -EINVAL;
|
|
|
|
*ret_li = l;
|
|
return 0;
|
|
}
|
|
|
|
int safe_atollu(const char *s, long long unsigned *ret_llu) {
|
|
char *x = NULL;
|
|
unsigned long long l;
|
|
|
|
assert(s);
|
|
assert(ret_llu);
|
|
|
|
errno = 0;
|
|
l = strtoull(s, &x, 0);
|
|
|
|
if (!x || *x || errno)
|
|
return errno ? -errno : -EINVAL;
|
|
|
|
*ret_llu = l;
|
|
return 0;
|
|
}
|
|
|
|
int safe_atolli(const char *s, long long int *ret_lli) {
|
|
char *x = NULL;
|
|
long long l;
|
|
|
|
assert(s);
|
|
assert(ret_lli);
|
|
|
|
errno = 0;
|
|
l = strtoll(s, &x, 0);
|
|
|
|
if (!x || *x || errno)
|
|
return errno ? -errno : -EINVAL;
|
|
|
|
*ret_lli = l;
|
|
return 0;
|
|
}
|
|
|
|
/* Split a string into words. */
|
|
char *split_spaces(const char *c, size_t *l, char **state) {
|
|
char *current;
|
|
|
|
current = *state ? *state : (char*) c;
|
|
|
|
if (!*current || *c == 0)
|
|
return NULL;
|
|
|
|
current += strspn(current, WHITESPACE);
|
|
*l = strcspn(current, WHITESPACE);
|
|
*state = current+*l;
|
|
|
|
return (char*) current;
|
|
}
|
|
|
|
/* Split a string into words, but consider strings enclosed in '' and
|
|
* "" as words even if they include spaces. */
|
|
char *split_quoted(const char *c, size_t *l, char **state) {
|
|
char *current;
|
|
|
|
current = *state ? *state : (char*) c;
|
|
|
|
if (!*current || *c == 0)
|
|
return NULL;
|
|
|
|
current += strspn(current, WHITESPACE);
|
|
|
|
if (*current == '\'') {
|
|
current ++;
|
|
*l = strcspn(current, "'");
|
|
*state = current+*l;
|
|
|
|
if (**state == '\'')
|
|
(*state)++;
|
|
} else if (*current == '\"') {
|
|
current ++;
|
|
*l = strcspn(current, "\"");
|
|
*state = current+*l;
|
|
|
|
if (**state == '\"')
|
|
(*state)++;
|
|
} else {
|
|
*l = strcspn(current, WHITESPACE);
|
|
*state = current+*l;
|
|
}
|
|
|
|
/* FIXME: Cannot deal with strings that have spaces AND ticks
|
|
* in them */
|
|
|
|
return (char*) current;
|
|
}
|
|
|
|
const char *sigchld_code(int code) {
|
|
|
|
if (code == CLD_EXITED)
|
|
return "exited";
|
|
else if (code == CLD_KILLED)
|
|
return "killed";
|
|
else if (code == CLD_DUMPED)
|
|
return "dumped";
|
|
else if (code == CLD_TRAPPED)
|
|
return "trapped";
|
|
else if (code == CLD_STOPPED)
|
|
return "stopped";
|
|
else if (code == CLD_CONTINUED)
|
|
return "continued";
|
|
|
|
return "unknown";
|
|
}
|
|
|
|
int get_parent_of_pid(pid_t pid, pid_t *_ppid) {
|
|
int r;
|
|
FILE *f;
|
|
char fn[132], line[256], *p;
|
|
long long unsigned ppid;
|
|
|
|
assert(pid >= 0);
|
|
assert(_ppid);
|
|
|
|
assert_se(snprintf(fn, sizeof(fn)-1, "/proc/%llu/stat", (unsigned long long) pid) < (int) (sizeof(fn)-1));
|
|
fn[sizeof(fn)-1] = 0;
|
|
|
|
if (!(f = fopen(fn, "r")))
|
|
return -errno;
|
|
|
|
if (!(fgets(line, sizeof(line), f))) {
|
|
r = -errno;
|
|
fclose(f);
|
|
return r;
|
|
}
|
|
|
|
fclose(f);
|
|
|
|
/* Let's skip the pid and comm fields. The latter is enclosed
|
|
* in () but does not escape any () in its value, so let's
|
|
* skip over it manually */
|
|
|
|
if (!(p = strrchr(line, ')')))
|
|
return -EIO;
|
|
|
|
p++;
|
|
|
|
if (sscanf(p, " "
|
|
"%*c " /* state */
|
|
"%llu ", /* ppid */
|
|
&ppid) != 1)
|
|
return -EIO;
|
|
|
|
if ((long long unsigned) (pid_t) ppid != ppid)
|
|
return -ERANGE;
|
|
|
|
*_ppid = (pid_t) ppid;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int write_one_line_file(const char *fn, const char *line) {
|
|
FILE *f;
|
|
int r;
|
|
|
|
assert(fn);
|
|
assert(line);
|
|
|
|
if (!(f = fopen(fn, "we")))
|
|
return -errno;
|
|
|
|
if (fputs(line, f) < 0) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
r = 0;
|
|
finish:
|
|
fclose(f);
|
|
return r;
|
|
}
|
|
|
|
int read_one_line_file(const char *fn, char **line) {
|
|
FILE *f;
|
|
int r;
|
|
char t[64], *c;
|
|
|
|
assert(fn);
|
|
assert(line);
|
|
|
|
if (!(f = fopen(fn, "re")))
|
|
return -errno;
|
|
|
|
if (!(fgets(t, sizeof(t), f))) {
|
|
r = -errno;
|
|
goto finish;
|
|
}
|
|
|
|
if (!(c = strdup(t))) {
|
|
r = -ENOMEM;
|
|
goto finish;
|
|
}
|
|
|
|
*line = c;
|
|
r = 0;
|
|
|
|
finish:
|
|
fclose(f);
|
|
return r;
|
|
}
|
|
|
|
char *strappend(const char *s, const char *suffix) {
|
|
size_t a, b;
|
|
char *r;
|
|
|
|
assert(s);
|
|
assert(suffix);
|
|
|
|
a = strlen(s);
|
|
b = strlen(suffix);
|
|
|
|
if (!(r = new(char, a+b+1)))
|
|
return NULL;
|
|
|
|
memcpy(r, s, a);
|
|
memcpy(r+a, suffix, b);
|
|
r[a+b] = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
int readlink_malloc(const char *p, char **r) {
|
|
size_t l = 100;
|
|
|
|
assert(p);
|
|
assert(r);
|
|
|
|
for (;;) {
|
|
char *c;
|
|
ssize_t n;
|
|
|
|
if (!(c = new(char, l)))
|
|
return -ENOMEM;
|
|
|
|
if ((n = readlink(p, c, l-1)) < 0) {
|
|
int ret = -errno;
|
|
free(c);
|
|
return ret;
|
|
}
|
|
|
|
if ((size_t) n < l-1) {
|
|
c[n] = 0;
|
|
*r = c;
|
|
return 0;
|
|
}
|
|
|
|
free(c);
|
|
l *= 2;
|
|
}
|
|
}
|
|
|
|
char *file_name_from_path(const char *p) {
|
|
char *r;
|
|
|
|
assert(p);
|
|
|
|
if ((r = strrchr(p, '/')))
|
|
return r + 1;
|
|
|
|
return (char*) p;
|
|
}
|
|
|
|
bool path_is_absolute(const char *p) {
|
|
assert(p);
|
|
|
|
return p[0] == '/';
|
|
}
|
|
|
|
bool is_path(const char *p) {
|
|
|
|
return !!strchr(p, '/');
|
|
}
|
|
|
|
char *path_make_absolute(const char *p, const char *prefix) {
|
|
char *r;
|
|
|
|
assert(p);
|
|
|
|
if (path_is_absolute(p) || !prefix)
|
|
return strdup(p);
|
|
|
|
if (asprintf(&r, "%s/%s", prefix, p) < 0)
|
|
return NULL;
|
|
|
|
return r;
|
|
}
|
|
|
|
int reset_all_signal_handlers(void) {
|
|
int sig;
|
|
|
|
for (sig = 1; sig < _NSIG; sig++) {
|
|
struct sigaction sa;
|
|
|
|
if (sig == SIGKILL || sig == SIGSTOP)
|
|
continue;
|
|
|
|
zero(sa);
|
|
sa.sa_handler = SIG_DFL;
|
|
sa.sa_flags = SA_RESTART;
|
|
|
|
/* On Linux the first two RT signals are reserved by
|
|
* glibc, and sigaction() will return EINVAL for them. */
|
|
if ((sigaction(sig, &sa, NULL) < 0))
|
|
if (errno != EINVAL)
|
|
return -errno;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
char *strstrip(char *s) {
|
|
char *e, *l = NULL;
|
|
|
|
/* Drops trailing whitespace. Modifies the string in
|
|
* place. Returns pointer to first non-space character */
|
|
|
|
s += strspn(s, WHITESPACE);
|
|
|
|
for (e = s; *e; e++)
|
|
if (!strchr(WHITESPACE, *e))
|
|
l = e;
|
|
|
|
if (l)
|
|
*(l+1) = 0;
|
|
else
|
|
*s = 0;
|
|
|
|
return s;
|
|
|
|
}
|
|
|
|
char *file_in_same_dir(const char *path, const char *filename) {
|
|
char *e, *r;
|
|
size_t k;
|
|
|
|
assert(path);
|
|
assert(filename);
|
|
|
|
/* This removes the last component of path and appends
|
|
* filename, unless the latter is absolute anyway or the
|
|
* former isn't */
|
|
|
|
if (path_is_absolute(filename))
|
|
return strdup(filename);
|
|
|
|
if (!(e = strrchr(path, '/')))
|
|
return strdup(filename);
|
|
|
|
k = strlen(filename);
|
|
if (!(r = new(char, e-path+1+k+1)))
|
|
return NULL;
|
|
|
|
memcpy(r, path, e-path+1);
|
|
memcpy(r+(e-path)+1, filename, k+1);
|
|
|
|
return r;
|
|
}
|
|
|
|
char hexchar(int x) {
|
|
static const char table[16] = "0123456789abcdef";
|
|
|
|
return table[x & 15];
|
|
}
|
|
|
|
int unhexchar(char c) {
|
|
|
|
if (c >= '0' && c <= '9')
|
|
return c - '0';
|
|
|
|
if (c >= 'a' && c <= 'f')
|
|
return c - 'a';
|
|
|
|
if (c >= 'A' && c <= 'F')
|
|
return c - 'A';
|
|
|
|
return -1;
|
|
}
|
|
|
|
char octchar(int x) {
|
|
return '0' + (x & 7);
|
|
}
|
|
|
|
int unoctchar(char c) {
|
|
|
|
if (c >= '0' && c <= '7')
|
|
return c - '0';
|
|
|
|
return -1;
|
|
}
|
|
|
|
char *cescape(const char *s) {
|
|
char *r, *t;
|
|
const char *f;
|
|
|
|
assert(s);
|
|
|
|
/* Does C style string escaping. */
|
|
|
|
if (!(r = new(char, strlen(s)*4 + 1)))
|
|
return NULL;
|
|
|
|
for (f = s, t = r; *f; f++)
|
|
|
|
switch (*f) {
|
|
|
|
case '\a':
|
|
*(t++) = '\\';
|
|
*(t++) = 'a';
|
|
break;
|
|
case '\b':
|
|
*(t++) = '\\';
|
|
*(t++) = 'b';
|
|
break;
|
|
case '\f':
|
|
*(t++) = '\\';
|
|
*(t++) = 'f';
|
|
break;
|
|
case '\n':
|
|
*(t++) = '\\';
|
|
*(t++) = 'n';
|
|
break;
|
|
case '\r':
|
|
*(t++) = '\\';
|
|
*(t++) = 'r';
|
|
break;
|
|
case '\t':
|
|
*(t++) = '\\';
|
|
*(t++) = 't';
|
|
break;
|
|
case '\v':
|
|
*(t++) = '\\';
|
|
*(t++) = 'v';
|
|
break;
|
|
case '\\':
|
|
*(t++) = '\\';
|
|
*(t++) = '\\';
|
|
break;
|
|
case '"':
|
|
*(t++) = '\\';
|
|
*(t++) = '"';
|
|
break;
|
|
case '\'':
|
|
*(t++) = '\\';
|
|
*(t++) = '\'';
|
|
break;
|
|
|
|
default:
|
|
/* For special chars we prefer octal over
|
|
* hexadecimal encoding, simply because glib's
|
|
* g_strescape() does the same */
|
|
if ((*f < ' ') || (*f >= 127)) {
|
|
*(t++) = '\\';
|
|
*(t++) = octchar((unsigned char) *f >> 6);
|
|
*(t++) = octchar((unsigned char) *f >> 3);
|
|
*(t++) = octchar((unsigned char) *f);
|
|
} else
|
|
*(t++) = *f;
|
|
break;
|
|
}
|
|
|
|
*t = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
char *cunescape(const char *s) {
|
|
char *r, *t;
|
|
const char *f;
|
|
|
|
assert(s);
|
|
|
|
/* Undoes C style string escaping */
|
|
|
|
if (!(r = new(char, strlen(s)+1)))
|
|
return r;
|
|
|
|
for (f = s, t = r; *f; f++) {
|
|
|
|
if (*f != '\\') {
|
|
*(t++) = *f;
|
|
continue;
|
|
}
|
|
|
|
f++;
|
|
|
|
switch (*f) {
|
|
|
|
case 'a':
|
|
*(t++) = '\a';
|
|
break;
|
|
case 'b':
|
|
*(t++) = '\b';
|
|
break;
|
|
case 'f':
|
|
*(t++) = '\f';
|
|
break;
|
|
case 'n':
|
|
*(t++) = '\n';
|
|
break;
|
|
case 'r':
|
|
*(t++) = '\r';
|
|
break;
|
|
case 't':
|
|
*(t++) = '\t';
|
|
break;
|
|
case 'v':
|
|
*(t++) = '\v';
|
|
break;
|
|
case '\\':
|
|
*(t++) = '\\';
|
|
break;
|
|
case '"':
|
|
*(t++) = '"';
|
|
break;
|
|
case '\'':
|
|
*(t++) = '\'';
|
|
break;
|
|
|
|
case 'x': {
|
|
/* hexadecimal encoding */
|
|
int a, b;
|
|
|
|
if ((a = unhexchar(f[1])) < 0 ||
|
|
(b = unhexchar(f[2])) < 0) {
|
|
/* Invalid escape code, let's take it literal then */
|
|
*(t++) = '\\';
|
|
*(t++) = 'x';
|
|
} else {
|
|
*(t++) = (char) ((a << 4) | b);
|
|
f += 2;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case '0':
|
|
case '1':
|
|
case '2':
|
|
case '3':
|
|
case '4':
|
|
case '5':
|
|
case '6':
|
|
case '7': {
|
|
/* octal encoding */
|
|
int a, b, c;
|
|
|
|
if ((a = unoctchar(f[0])) < 0 ||
|
|
(b = unoctchar(f[1])) < 0 ||
|
|
(c = unoctchar(f[2])) < 0) {
|
|
/* Invalid escape code, let's take it literal then */
|
|
*(t++) = '\\';
|
|
*(t++) = f[0];
|
|
} else {
|
|
*(t++) = (char) ((a << 6) | (b << 3) | c);
|
|
f += 2;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
case 0:
|
|
/* premature end of string.*/
|
|
*(t++) = '\\';
|
|
goto finish;
|
|
|
|
default:
|
|
/* Invalid escape code, let's take it literal then */
|
|
*(t++) = '\\';
|
|
*(t++) = 'f';
|
|
break;
|
|
}
|
|
}
|
|
|
|
finish:
|
|
*t = 0;
|
|
return r;
|
|
}
|
|
|
|
|
|
char *xescape(const char *s, const char *bad) {
|
|
char *r, *t;
|
|
const char *f;
|
|
|
|
/* Escapes all chars in bad, in addition to \ and all special
|
|
* chars, in \xFF style escaping. May be reversed with
|
|
* cunescape. */
|
|
|
|
if (!(r = new(char, strlen(s)*4+1)))
|
|
return NULL;
|
|
|
|
for (f = s, t = r; *f; f++) {
|
|
|
|
if (*f < ' ' || *f >= 127 ||
|
|
*f == '\\' || strchr(bad, *f)) {
|
|
*(t++) = '\\';
|
|
*(t++) = 'x';
|
|
*(t++) = hexchar(*f >> 4);
|
|
*(t++) = hexchar(*f);
|
|
} else
|
|
*(t++) = *f;
|
|
}
|
|
|
|
*t = 0;
|
|
|
|
return r;
|
|
}
|
|
|
|
char *path_kill_slashes(char *path) {
|
|
char *f, *t;
|
|
bool slash = false;
|
|
|
|
/* Removes redundant inner and trailing slashes. Modifies the
|
|
* passed string in-place.
|
|
*
|
|
* ///foo///bar/ becomes /foo/bar
|
|
*/
|
|
|
|
for (f = path, t = path; *f; f++) {
|
|
|
|
if (*f == '/') {
|
|
slash = true;
|
|
continue;
|
|
}
|
|
|
|
if (slash) {
|
|
slash = false;
|
|
*(t++) = '/';
|
|
}
|
|
|
|
*(t++) = *f;
|
|
}
|
|
|
|
/* Special rule, if we are talking of the root directory, a
|
|
trailing slash is good */
|
|
|
|
if (t == path && slash)
|
|
*(t++) = '/';
|
|
|
|
*t = 0;
|
|
return path;
|
|
}
|
|
|
|
bool path_startswith(const char *path, const char *prefix) {
|
|
assert(path);
|
|
assert(prefix);
|
|
|
|
if ((path[0] == '/') != (prefix[0] == '/'))
|
|
return false;
|
|
|
|
for (;;) {
|
|
size_t a, b;
|
|
|
|
path += strspn(path, "/");
|
|
prefix += strspn(prefix, "/");
|
|
|
|
if (*prefix == 0)
|
|
return true;
|
|
|
|
if (*path == 0)
|
|
return false;
|
|
|
|
a = strcspn(path, "/");
|
|
b = strcspn(prefix, "/");
|
|
|
|
if (a != b)
|
|
return false;
|
|
|
|
if (memcmp(path, prefix, a) != 0)
|
|
return false;
|
|
|
|
path += a;
|
|
prefix += b;
|
|
}
|
|
}
|
|
|
|
char *ascii_strlower(char *path) {
|
|
char *p;
|
|
|
|
assert(path);
|
|
|
|
for (p = path; *p; p++)
|
|
if (*p >= 'A' && *p <= 'Z')
|
|
*p = *p - 'A' + 'a';
|
|
|
|
return p;
|
|
}
|