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https://github.com/ZDoom/raze-gles.git
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61 lines
1 KiB
C++
61 lines
1 KiB
C++
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#include "src/parse/unescape.h"
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namespace re2c {
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// expected characters: [0-9a-zA-Z]
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static inline uint32_t hex_digit (const char c)
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{
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switch (c)
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{
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case '0': return 0;
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case '1': return 1;
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case '2': return 2;
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case '3': return 3;
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case '4': return 4;
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case '5': return 5;
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case '6': return 6;
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case '7': return 7;
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case '8': return 8;
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case '9': return 9;
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case 'a':
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case 'A': return 0xA;
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case 'b':
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case 'B': return 0xB;
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case 'c':
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case 'C': return 0xC;
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case 'd':
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case 'D': return 0xD;
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case 'e':
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case 'E': return 0xE;
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case 'f':
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case 'F': return 0xF;
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default: return ~0u; // unexpected
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}
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}
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// expected string format: "\" [xXuU] [0-9a-zA-Z]*
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uint32_t unesc_hex (const char * s, const char * s_end)
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{
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uint32_t n = 0;
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for (s += 2; s != s_end; ++s)
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{
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n <<= 4;
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n += hex_digit (*s);
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}
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return n;
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}
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// expected string format: "\" [0-7]*
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uint32_t unesc_oct (const char * s, const char * s_end)
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{
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uint32_t n = 0;
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for (++s; s != s_end; ++s)
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{
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n <<= 3;
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n += static_cast<uint8_t> (*s - '0');
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}
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return n;
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}
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} // namespace re2c
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