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utils: add strlen() variant which calculates length of string as printed on the screen

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This commit is contained in:
Steffen Vogel 2017-07-12 00:51:23 +02:00
parent 94ae566091
commit dc4085047d
2 changed files with 43 additions and 1 deletions
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5
include/villas/utils.h
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@ -248,4 +248,7 @@ int signals_init(void (*cb)(int signal, siginfo_t *sinfo, void *ctx));
/** Send signal \p sig to main thread. */
void killme(int sig);
pid_t spawn(const char* name, char *const argv[]);
pid_t spawn(const char *name, char *const argv[]);
/** Determines the string length as printed on the screen (ignores escable sequences). */
size_t strlenp(const char *str);

39
lib/utils.c
View file

@ -355,3 +355,42 @@ pid_t spawn(const char* name, char *const argv[])
return pid;
}
size_t strlenp(const char *str)
{
size_t sz = 0;
for (const char *d = str; *d; d++) {
const unsigned char *c = (const unsigned char *) d;
if (isprint(*c))
sz++;
else if (c[0] == '\b')
sz--;
else if (c[0] == '\t')
sz += 4; /* tab width == 4 */
/* CSI sequence */
else if (c[0] == '\e' && c[1] == '[') {
c += 2;
while (*c && *c != 'm')
c++;
}
/* UTF-8 */
else if (c[0] >= 0xc2 && c[0] <= 0xdf) {
sz++;
c += 1;
}
else if (c[0] >= 0xe0 && c[0] <= 0xef) {
sz++;
c += 2;
}
else if (c[0] >= 0xf0 && c[0] <= 0xf4) {
sz++;
c += 3;
}
d = (const char *) c;
}
return sz;
}