mirror of https://github.com/flysand7/ciabatta.git
75 lines
1.9 KiB
C
75 lines
1.9 KiB
C
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static inline int pfx(fmt_isdigit)(ctype ch) {
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return '0' <= ch && ch <= '9';
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}
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static inline int pfx(fmt_atoi)(ctype const **sp, int *err) {
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int i = 0;
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ctype const *s = *sp;
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while(pfx(fmt_isdigit(*s))) {
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int d = *s-'0';
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if(i > (INT_MAX - d)/10) {
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*err = 1;
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return 0;
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}
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i = 10*i + d;
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++s;
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}
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*sp = s;
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return i;
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}
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static inline int pfx(fmt_read)(const ctype *str, fmt_t *fmt, va_list va) {
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int flags = 0;
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// Parse flag field
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{
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int isflag = 0;
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do {
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isflag = 1;
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switch(*str) {
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case '0': flags |= FLAG_ZERO; break;
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case '-': flags |= FLAG_LEFT; break;
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case '+': flags |= FLAG_PLUS; break;
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case ' ': flags |= FLAG_SPACE; break;
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case '#': flags |= FLAG_HASH; break;
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default: isflag = 0;
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}
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if(isflag) ++str;
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} while(isflag);
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// If '-' and '0' are together we just discard '0'
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if(flags & FLAG_LEFT) flags &= ~FLAG_ZERO;
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}
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// Parse width field
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int width = 0;
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if(pfx(fmt_isdigit(*str))) {
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int err = 0;
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width = pfx(fmt_atoi(&str, &err));
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if(err) return 0;
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}
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else if(*str == '*') {
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++str;
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width = va_arg(va, int);
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if(width < 0) {
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width = -width;
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flags |= FLAG_LEFT;
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}
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}
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// If present, parse the precision field
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int prec = 0;
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if(*str == '.') {
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flags |= FLAG_PREC;
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++str;
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if(pfx(fmt_isdigit(*str))) {
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int err = 0;
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prec = pfx(fmt_atoi(&str, &err));
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if(err) return -1;
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}
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else if(*str == '*') {
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++str;
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prec = va_arg(va, int);
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prec = (prec > 0? prec : 0);
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}
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}
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return 1;
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}
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