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ee5da4468d
Widths and fractional widths greater than 255 would overflow a uint8_t and wrap around to smaller values. Total formatted lengths greater than the avilable buffer size would overflow it and potentially corrupt memory. Fixes #830 Closes #831
64 lines
1.5 KiB
C
64 lines
1.5 KiB
C
/*
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* This file is part of RGBDS.
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*
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* Copyright (c) 2020, RGBDS contributors.
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*
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* SPDX-License-Identifier: MIT
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*/
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#ifndef RGBDS_FORMAT_SPEC_H
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#define RGBDS_FORMAT_SPEC_H
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#include <stdint.h>
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#include <stdbool.h>
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enum FormatState {
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FORMAT_SIGN, // expects '+' or ' ' (optional)
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FORMAT_PREFIX, // expects '#' (optional)
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FORMAT_ALIGN, // expects '-' (optional)
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FORMAT_WIDTH, // expects '0'-'9', max 255 (optional) (leading '0' indicates pad)
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FORMAT_FRAC, // got '.', expects '0'-'9', max 255 (optional)
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FORMAT_DONE, // got [duXxbofs] (required)
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FORMAT_INVALID, // got unexpected character
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};
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struct FormatSpec {
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enum FormatState state;
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int sign;
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bool prefix;
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bool alignLeft;
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bool padZero;
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size_t width;
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bool hasFrac;
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size_t fracWidth;
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int type;
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bool valid;
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};
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struct StrFmtArg {
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union {
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uint32_t number;
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char *string;
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};
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bool isNumeric;
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};
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#define INITIAL_STRFMT_ARG_SIZE 4
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struct StrFmtArgList {
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char *format;
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size_t nbArgs;
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size_t capacity;
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struct StrFmtArg *args;
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};
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struct FormatSpec fmt_NewSpec(void);
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bool fmt_IsEmpty(struct FormatSpec const *fmt);
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bool fmt_IsValid(struct FormatSpec const *fmt);
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bool fmt_IsFinished(struct FormatSpec const *fmt);
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void fmt_UseCharacter(struct FormatSpec *fmt, int c);
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void fmt_FinishCharacters(struct FormatSpec *fmt);
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void fmt_PrintString(char *buf, size_t bufLen, struct FormatSpec const *fmt, char const *value);
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void fmt_PrintNumber(char *buf, size_t bufLen, struct FormatSpec const *fmt, uint32_t value);
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#endif /* RGBDS_FORMAT_SPEC_H */
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