mirror of
https://framagit.org/bortzmeyer/echoping
synced 2024-11-18 15:26:17 +00:00
47 lines
926 B
C
47 lines
926 B
C
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/*
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* Read a line from a descriptor. Read the line one byte at a time, looking
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* for the newline. We store the newline in the buffer, then follow it with
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* a null (the same as fgets(3)). We return the number of characters up to,
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* but not including, the null (the same as strlen(3)). If ln == 0, we treat
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* newline as an ordinary charracter.
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*/
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/* Stolen from Stevens' book */
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#include "echoping.h"
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int
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readline (fd, ptr, maxlen, ln)
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int fd;
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char *ptr;
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int maxlen;
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unsigned short ln;
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{
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int n, rc;
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char c;
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for (n = 1; n < maxlen; n++)
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{
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if (timeout_flag)
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return n;
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if ((rc = read (fd, &c, 1)) == 1)
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{
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*ptr++ = c;
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if (c == '\n' && ln == 1)
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break;
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}
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else if (rc == 0)
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{
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if (n == 1)
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return (0); /* EOF, no data read */
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else
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break; /* EOF, some data was read */
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}
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else
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return (-1); /* error */
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}
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*ptr = 0;
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return (n);
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}
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