34 lines
873 B
C
34 lines
873 B
C
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/*
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* Posix stdio -- fdopen
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*/
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#include "iolib.h"
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/*
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* Open the named file with the given mode, using the given FILE
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* Legal modes are given below, `additional characters may follow these sequences':
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* r rb open to read
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* w wb open to write, truncating
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* a ab open to write positioned at eof, creating if non-existant
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* r+ r+b rb+ open to read and write, creating if non-existant
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* w+ w+b wb+ open to read and write, truncating
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* a+ a+b ab+ open to read and write, positioned at eof, creating if non-existant.
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*/
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FILE *fdopen(const int fd, const char *mode){
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FILE *f;
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for(f=_IO_stream;f!=&_IO_stream[FOPEN_MAX];f++)
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if(f->state==CLOSED)
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break;
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if(f==&_IO_stream[FOPEN_MAX])
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return NULL;
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f->fd=fd;
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if(mode[0]=='a')
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lseek(f->fd, 0L, 2);
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if(f->fd==-1) return NULL;
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f->flags=0;
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f->state=OPEN;
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f->buf=0;
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f->rp=0;
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f->wp=0;
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f->lp=0;
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return f;
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}
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