| Current File : //proc/thread-self/root/kunden/usr/include/spa-0.2/spa/utils/string.h |
/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2021 Red Hat, Inc. */
/* SPDX-License-Identifier: MIT */
#ifndef SPA_UTILS_STRING_H
#define SPA_UTILS_STRING_H
#ifdef __cplusplus
extern "C" {
#endif
#include <stdarg.h>
#include <stdbool.h>
#include <errno.h>
#include <stdlib.h>
#include <locale.h>
#include <spa/utils/defs.h>
/**
* \defgroup spa_string String handling
* String handling utilities
*/
/**
* \addtogroup spa_string
* \{
*/
/**
* \return true if the two strings are equal, false otherwise
*
* If both \a a and \a b are NULL, the two are considered equal.
*
*/
static inline bool spa_streq(const char *s1, const char *s2)
{
return SPA_LIKELY(s1 && s2) ? strcmp(s1, s2) == 0 : s1 == s2;
}
/**
* \return true if the two strings are equal, false otherwise
*
* If both \a a and \a b are NULL, the two are considered equal.
*/
static inline bool spa_strneq(const char *s1, const char *s2, size_t len)
{
return SPA_LIKELY(s1 && s2) ? strncmp(s1, s2, len) == 0 : s1 == s2;
}
/**
* \return true if \a s starts with the \a prefix or false otherwise.
* A \a s is NULL, it never starts with the given \a prefix. A \a prefix of
* NULL is a bug in the caller.
*/
static inline bool spa_strstartswith(const char *s, const char *prefix)
{
if (SPA_UNLIKELY(s == NULL))
return false;
spa_assert_se(prefix);
return strncmp(s, prefix, strlen(prefix)) == 0;
}
/**
* \return true if \a s ends with the \a suffix or false otherwise.
* A \a s is NULL, it never ends with the given \a suffix. A \a suffix of
* NULL is a bug in the caller.
*/
static inline bool spa_strendswith(const char *s, const char *suffix)
{
size_t l1, l2;
if (SPA_UNLIKELY(s == NULL))
return false;
spa_assert_se(suffix);
l1 = strlen(s);
l2 = strlen(suffix);
return l1 >= l2 && spa_streq(s + l1 - l2, suffix);
}
/**
* Convert \a str to an int32_t with the given \a base and store the
* result in \a val.
*
* On failure, the value of \a val is unmodified.
*
* \return true on success, false otherwise
*/
static inline bool spa_atoi32(const char *str, int32_t *val, int base)
{
char *endptr;
long v;
if (!str || *str =='\0')
return false;
errno = 0;
v = strtol(str, &endptr, base);
if (errno != 0 || *endptr != '\0')
return false;
if (v != (int32_t)v)
return false;
*val = v;
return true;
}
/**
* Convert \a str to an uint32_t with the given \a base and store the
* result in \a val.
*
* On failure, the value of \a val is unmodified.
*
* \return true on success, false otherwise
*/
static inline bool spa_atou32(const char *str, uint32_t *val, int base)
{
char *endptr;
unsigned long long v;
if (!str || *str =='\0')
return false;
errno = 0;
v = strtoull(str, &endptr, base);
if (errno != 0 || *endptr != '\0')
return false;
if (v != (uint32_t)v)
return false;
*val = v;
return true;
}
/**
* Convert \a str to an int64_t with the given \a base and store the
* result in \a val.
*
* On failure, the value of \a val is unmodified.
*
* \return true on success, false otherwise
*/
static inline bool spa_atoi64(const char *str, int64_t *val, int base)
{
char *endptr;
long long v;
if (!str || *str =='\0')
return false;
errno = 0;
v = strtoll(str, &endptr, base);
if (errno != 0 || *endptr != '\0')
return false;
*val = v;
return true;
}
/**
* Convert \a str to an uint64_t with the given \a base and store the
* result in \a val.
*
* On failure, the value of \a val is unmodified.
*
* \return true on success, false otherwise
*/
static inline bool spa_atou64(const char *str, uint64_t *val, int base)
{
char *endptr;
unsigned long long v;
if (!str || *str =='\0')
return false;
errno = 0;
v = strtoull(str, &endptr, base);
if (errno != 0 || *endptr != '\0')
return false;
*val = v;
return true;
}
/**
* Convert \a str to a boolean. Allowed boolean values are "true" and a
* literal "1", anything else is false.
*
* \return true on success, false otherwise
*/
static inline bool spa_atob(const char *str)
{
return spa_streq(str, "true") || spa_streq(str, "1");
}
/**
* "Safe" version of vsnprintf. Exactly the same as vsnprintf but the
* returned value is clipped to `size - 1` and a negative or zero size
* will abort() the program.
*
* \return The number of bytes printed, capped to `size-1`, or a negative
* number on error.
*/
SPA_PRINTF_FUNC(3, 0)
static inline int spa_vscnprintf(char *buffer, size_t size, const char *format, va_list args)
{
int r;
spa_assert_se((ssize_t)size > 0);
r = vsnprintf(buffer, size, format, args);
if (SPA_UNLIKELY(r < 0))
buffer[0] = '\0';
if (SPA_LIKELY(r < (ssize_t)size))
return r;
return size - 1;
}
/**
* "Safe" version of snprintf. Exactly the same as snprintf but the
* returned value is clipped to `size - 1` and a negative or zero size
* will abort() the program.
*
* \return The number of bytes printed, capped to `size-1`, or a negative
* number on error.
*/
SPA_PRINTF_FUNC(3, 4)
static inline int spa_scnprintf(char *buffer, size_t size, const char *format, ...)
{
int r;
va_list args;
va_start(args, format);
r = spa_vscnprintf(buffer, size, format, args);
va_end(args);
return r;
}
/**
* Convert \a str to a float in the C locale.
*
* If \a endptr is not NULL, a pointer to the character after the last character
* used in the conversion is stored in the location referenced by endptr.
*
* \return the result float.
*/
static inline float spa_strtof(const char *str, char **endptr)
{
#ifndef __LOCALE_C_ONLY
static locale_t locale = NULL;
locale_t prev;
#endif
float v;
#ifndef __LOCALE_C_ONLY
if (SPA_UNLIKELY(locale == NULL))
locale = newlocale(LC_ALL_MASK, "C", NULL);
prev = uselocale(locale);
#endif
v = strtof(str, endptr);
#ifndef __LOCALE_C_ONLY
uselocale(prev);
#endif
return v;
}
/**
* Convert \a str to a float and store the result in \a val.
*
* On failure, the value of \a val is unmodified.
*
* \return true on success, false otherwise
*/
static inline bool spa_atof(const char *str, float *val)
{
char *endptr;
float v;
if (!str || *str =='\0')
return false;
errno = 0;
v = spa_strtof(str, &endptr);
if (errno != 0 || *endptr != '\0')
return false;
*val = v;
return true;
}
/**
* Convert \a str to a double in the C locale.
*
* If \a endptr is not NULL, a pointer to the character after the last character
* used in the conversion is stored in the location referenced by endptr.
*
* \return the result float.
*/
static inline double spa_strtod(const char *str, char **endptr)
{
#ifndef __LOCALE_C_ONLY
static locale_t locale = NULL;
locale_t prev;
#endif
double v;
#ifndef __LOCALE_C_ONLY
if (SPA_UNLIKELY(locale == NULL))
locale = newlocale(LC_ALL_MASK, "C", NULL);
prev = uselocale(locale);
#endif
v = strtod(str, endptr);
#ifndef __LOCALE_C_ONLY
uselocale(prev);
#endif
return v;
}
/**
* Convert \a str to a double and store the result in \a val.
*
* On failure, the value of \a val is unmodified.
*
* \return true on success, false otherwise
*/
static inline bool spa_atod(const char *str, double *val)
{
char *endptr;
double v;
if (!str || *str =='\0')
return false;
errno = 0;
v = spa_strtod(str, &endptr);
if (errno != 0 || *endptr != '\0')
return false;
*val = v;
return true;
}
static inline char *spa_dtoa(char *str, size_t size, double val)
{
int i, l;
l = spa_scnprintf(str, size, "%f", val);
for (i = 0; i < l; i++)
if (str[i] == ',')
str[i] = '.';
return str;
}
struct spa_strbuf {
char *buffer;
size_t maxsize;
size_t pos;
};
static inline void spa_strbuf_init(struct spa_strbuf *buf, char *buffer, size_t maxsize)
{
buf->buffer = buffer;
buf->maxsize = maxsize;
buf->pos = 0;
}
SPA_PRINTF_FUNC(2, 3)
static inline int spa_strbuf_append(struct spa_strbuf *buf, const char *fmt, ...)
{
size_t remain = buf->maxsize - buf->pos;
ssize_t written;
va_list args;
va_start(args, fmt);
written = vsnprintf(&buf->buffer[buf->pos], remain, fmt, args);
va_end(args);
if (written > 0)
buf->pos += SPA_MIN(remain, (size_t)written);
return written;
}
/**
* \}
*/
#ifdef __cplusplus
} /* extern "C" */
#endif
#endif /* SPA_UTILS_STRING_H */