| 161 | } |
| 162 | |
| 163 | static void append_quoted(cbm_sb_t *sb, const char *s) { |
| 164 | cbm_sb_append_n(sb, "\"", 1); |
| 165 | for (const char *p = s ? s : ""; *p; p++) { |
| 166 | switch (*p) { |
| 167 | case '"': |
| 168 | cbm_sb_append_n(sb, "\\\"", 2); |
| 169 | break; |
| 170 | case '\\': |
| 171 | cbm_sb_append_n(sb, "\\\\", 2); |
| 172 | break; |
| 173 | case '\n': |
| 174 | cbm_sb_append_n(sb, "\\n", 2); |
| 175 | break; |
| 176 | case '\r': |
| 177 | cbm_sb_append_n(sb, "\\r", 2); |
| 178 | break; |
| 179 | default: { |
| 180 | unsigned char c = (unsigned char)*p; |
| 181 | if (c >= 0x20 && c != 0x7f && c < 0x80) { |
| 182 | cbm_sb_append_n(sb, p, 1); |
| 183 | } else if (c < 0x20 || c == 0x7f) { |
| 184 | /* JSON-style escape: the value stays one printable line. */ |
| 185 | char esc[8]; |
| 186 | snprintf(esc, sizeof(esc), "\\u%04x", (unsigned)c); |
| 187 | cbm_sb_append(sb, esc); |
| 188 | } else { |
| 189 | size_t len = utf8_sequence_length((const unsigned char *)p); |
| 190 | if (len) { |
| 191 | cbm_sb_append_n(sb, p, len); |
| 192 | p += len - 1; |
| 193 | } else { |
| 194 | /* Invalid byte → U+FFFD: output is valid UTF-8 by |
| 195 | * construction, and the corruption stays visible. */ |
| 196 | cbm_sb_append_n(sb, "\xEF\xBF\xBD", 3); |
| 197 | } |
| 198 | } |
| 199 | break; |
| 200 | } |
| 201 | } |
| 202 | } |
| 203 | cbm_sb_append_n(sb, "\"", 1); |
| 204 | } |
| 205 | |
| 206 | static void append_value(cbm_sb_t *sb, const char *s) { |
| 207 | if (!s || !*s) { |
no test coverage detected