116 lines
1.9 KiB
C
116 lines
1.9 KiB
C
/* cat.c -- program to concatenate named files and/or stdin onto stdout */
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/* version 2 */
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <string.h>
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#include "support.h"
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/* parameters */
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enum
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{
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U
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};
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/* concat - return a buffer of size new_size containing s1 and s2 concatenated. */
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char *concat(char *a1, char *a2, int a1_size, int a2_size)
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{
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char *newbuf;
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newbuf = 0;
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if( !(newbuf = malloc(a1_size+a2_size)))
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{
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throw(MALLOC_FAIL, "concat: couldn't create buffer");
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}
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if(a1_size)
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{
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mid_mempcpy(newbuf, a1, a1_size, 0);
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}
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if(a2_size)
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{
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mid_mempcpy(newbuf, a2, a2_size, a1_size);
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}
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return(newbuf);
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}
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int main(int argc, char **argv)
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{
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int i, c, bufsize, newbufsize;
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char *buf, *newbuf;
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char pars[1] = {0};
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FILE *fd;
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i = c = bufsize = newbufsize = 0;
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buf = newbuf = 0;
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fd = 0;
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/* process our parameters */
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for(; (c = getopt(argc, argv, "u")) != -1; c = 0)
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{
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switch(c)
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{
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case 'u': pars[U] = 1;
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break;
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case ':':
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case '?':
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default: throw(NEEDARG_FAIL, mastrcat(argv[0], " [-u] [file ...]"));
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break;
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}
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}
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i = optind;
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/* i < argc is obvious; steps through all provided args. */
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/* !argc-optind && !c is a little less so - it allows this loop to run once if the user provides no paths */
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do
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{
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if( !(fd = file_open(argv[i], "r")))
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{
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throw(FOPEN_FAIL, mastrcat(argv[0], mastrcat(": could not open file ", argv[i])));
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}
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if(pars[U])
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{
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for(; (c = fgetc(fd)) != EOF; c = 0)
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{
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fputc(c, stdout);
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}
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}
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else
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{
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newbuf = file_read(fd, &newbufsize);
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buf = concat(buf, newbuf, bufsize, newbufsize);
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bufsize += newbufsize;
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free(newbuf);
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}
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i++, newbufsize = 0;
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}
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while((i < argc) || (((argc - optind) == 0) && !c));
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if(!pars[U])
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{
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fwrite(buf, sizeof(char), bufsize, stdout);
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}
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exit(0);
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}
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