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affcbddbb0
Create a format_string_std function that works like format_string, but does return a std::string instead of a strdup()ed C string. Make it a global function to be used in other parts of the code. Signed-off-by: Berthold Stoeger <bstoeger@mail.tuwien.ac.at>
80 lines
2 KiB
C++
80 lines
2 KiB
C++
// SPDX-License-Identifier: GPL-2.0
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#ifndef SUBSURFACE_STRING_H
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#define SUBSURFACE_STRING_H
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#include <stdbool.h>
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#include <string.h>
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#include <time.h>
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// shared generic definitions and macros
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// mostly about strings, but a couple of math macros are here as well
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/* Windows has no MIN/MAX macros - so let's just roll our own */
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#define MIN(x, y) ({ \
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__typeof__(x) _min1 = (x); \
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__typeof__(y) _min2 = (y); \
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(void) (&_min1 == &_min2); \
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_min1 < _min2 ? _min1 : _min2; })
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#define MAX(x, y) ({ \
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__typeof__(x) _max1 = (x); \
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__typeof__(y) _max2 = (y); \
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(void) (&_max1 == &_max2); \
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_max1 > _max2 ? _max1 : _max2; })
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#ifdef __cplusplus
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extern "C" {
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#endif
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// string handling
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static inline bool same_string(const char *a, const char *b)
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{
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return !strcmp(a ?: "", b ?: "");
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}
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static inline bool same_string_caseinsensitive(const char *a, const char *b)
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{
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return !strcasecmp(a ?: "", b ?: "");
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}
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static inline bool empty_string(const char *s)
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{
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return !s || !*s;
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}
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static inline char *copy_string(const char *s)
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{
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return (s && *s) ? strdup(s) : NULL;
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}
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#define STRTOD_NO_SIGN 0x01
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#define STRTOD_NO_DOT 0x02
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#define STRTOD_NO_COMMA 0x04
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#define STRTOD_NO_EXPONENT 0x08
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extern double strtod_flags(const char *str, const char **ptr, unsigned int flags);
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#define STRTOD_ASCII (STRTOD_NO_COMMA)
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#define ascii_strtod(str, ptr) strtod_flags(str, ptr, STRTOD_ASCII)
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#ifdef __cplusplus
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}
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#include <string>
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template <class... Args>
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std::string format_string_std(const char *fmt, Args&&... args)
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{
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size_t stringsize = snprintf(NULL, 0, fmt, std::forward<Args>(args)...);
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if (stringsize == 0)
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return std::string();
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std::string res;
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res.resize(stringsize); // Pointless clearing, oh my.
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// This overwrites the terminal null-byte of std::string.
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// That's probably "undefined behavior". Oh my.
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snprintf(res.data(), stringsize + 1, fmt, std::forward<Args>(args)...);
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return res;
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}
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#endif
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#endif // SUBSURFACE_STRING_H
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