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58 lines
1019 B
58 lines
1019 B
#include "builtin.h" |
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/* |
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* Remove empty lines from the beginning and end. |
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* |
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* Turn multiple consecutive empty lines into just one |
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* empty line. Return true if it is an incomplete line. |
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*/ |
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static int cleanup(char *line) |
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{ |
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int len = strlen(line); |
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if (len && line[len-1] == '\n') { |
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if (len == 1) |
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return 0; |
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do { |
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unsigned char c = line[len-2]; |
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if (!isspace(c)) |
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break; |
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line[len-2] = '\n'; |
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len--; |
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line[len] = 0; |
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} while (len > 1); |
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return 0; |
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} |
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return 1; |
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} |
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static void stripspace(FILE *in, FILE *out) |
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{ |
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int empties = -1; |
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int incomplete = 0; |
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char line[1024]; |
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while (fgets(line, sizeof(line), in)) { |
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incomplete = cleanup(line); |
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/* Not just an empty line? */ |
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if (line[0] != '\n') { |
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if (empties > 0) |
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fputc('\n', out); |
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empties = 0; |
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fputs(line, out); |
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continue; |
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} |
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if (empties < 0) |
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continue; |
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empties++; |
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} |
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if (incomplete) |
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fputc('\n', out); |
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} |
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int cmd_stripspace(int argc, const char **argv, const char *prefix) |
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{ |
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stripspace(stdin, stdout); |
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return 0; |
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}
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