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/* Common functions for our test programs. */ #include "tests.h" size_t lineno = 0; void check(int cond, const char *format, ...){     if (!cond) {          va_list args;          fprintf(stderr, "line %zd: ", lineno);          va_start(args, format);          vfprintf(stderr, format, args);          va_end(args);          fprintf(stderr, "\n");          exit(1);     }} size_t skipspaces(const char *buf, size_t i){    while (isspace(buf[i])) ++i;    return i;} /* if buf points to a sequence of codepoints encoded as hexadecimal strings,   separated by whitespace, and terminated by any character not in   [0-9a-fA-F] or whitespace, then stores the corresponding utf8 string   in dest, returning the number of bytes read from buf */size_t encode(char *dest, const char *buf){     size_t i = 0, j, d = 0;     for (;;) {          int c;          i = skipspaces(buf, i);          for (j=i; buf[j] && strchr("0123456789abcdef", tolower(buf[j])); ++j)               ; /* find end of hex input */          if (j == i) { /* no codepoint found */               dest[d] = 0; /* NUL-terminate destination string */               return i + 1;          }          check(sscanf(buf + i, "%x", (unsigned int *)&c) == 1, "invalid hex input %s", buf+i);          i = j; /* skip to char after hex input */          d += utf8proc_encode_char(c, (utf8proc_uint8_t *) (dest + d));     }}