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Add format_str() and vformat_str()

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Simple helpers to allocate and format a string.
This commit is contained in:
Simon Ser 2023-02-28 16:00:28 +01:00
parent 4118c49349
commit aab4c9da5f
2 changed files with 42 additions and 0 deletions
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33
common/stringop.c
View file

@ -1,5 +1,6 @@
#define _POSIX_C_SOURCE 200809L
#include <ctype.h>
#include <stdarg.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
@ -328,3 +329,35 @@ bool expand_path(char **path) {
wordfree(&p);
return true;
}
char *vformat_str(const char *fmt, va_list args) {
char *str = NULL;
va_list args_copy;
va_copy(args_copy, args);
int len = vsnprintf(NULL, 0, fmt, args);
if (len < 0) {
sway_log_errno(SWAY_ERROR, "vsnprintf(\"%s\") failed", fmt);
goto out;
}
str = malloc(len + 1);
if (str == NULL) {
sway_log_errno(SWAY_ERROR, "malloc() failed");
goto out;
}
vsnprintf(str, len + 1, fmt, args_copy);
out:
va_end(args_copy);
return str;
}
char *format_str(const char *fmt, ...) {
va_list args;
va_start(args, fmt);
char *str = vformat_str(fmt, args);
va_end(args);
return str;
}

9
include/stringop.h
View file

@ -5,6 +5,12 @@
#include <stddef.h>
#include "list.h"
#ifdef __GNUC__
#define _SWAY_ATTRIB_PRINTF(start, end) __attribute__((format(printf, start, end)))
#else
#define _SWAY_ATTRIB_PRINTF(start, end)
#endif
void strip_whitespace(char *str);
void strip_quotes(char *str);
@ -31,4 +37,7 @@ char *argsep(char **stringp, const char *delim, char *matched_delim);
// Expand a path using shell replacements such as $HOME and ~
bool expand_path(char **path);
char *vformat_str(const char *fmt, va_list args) _SWAY_ATTRIB_PRINTF(1, 0);
char *format_str(const char *fmt, ...) _SWAY_ATTRIB_PRINTF(1, 2);
#endif