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27 lines
821 B
C
27 lines
821 B
C
#include "fmt.h"
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/* "foo" -> " foo"
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* write padlen-srclen spaces, if that is >= 0. Then copy srclen
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* characters from src. Truncate only if total length is larger than
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* maxlen. Return number of characters written. */
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size_t fmt_pad(char* dest,const char* src,size_t srclen,size_t padlen,size_t maxlen) {
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long todo;
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char* olddest=dest;
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char* max=dest+maxlen;
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if ((long)srclen<0 || (long)padlen<0 || (long)maxlen<0) return 0;
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todo=(long)(padlen-srclen);
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if (dest==0) {
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unsigned long sum=srclen>padlen?srclen:padlen;
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return sum>maxlen?maxlen:sum;
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}
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for (; todo>0; --todo) {
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if (dest>max) break;
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*dest=' '; ++dest;
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}
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for (todo=(long)(srclen>maxlen?maxlen:srclen); todo>0; --todo) {
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if (dest>max) break;
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*dest=*src; ++dest; ++src;
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}
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return (size_t)(dest-olddest);
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}
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